In my old motorbike I use Shell Rotella diesel oil, my other toy is a Mazda RX8 rotary, also very hard on oil and many owners also swear by Rotella, either dino or synthetic. They supposedly have more detergents to gather the soot and a better anti wear package than most gas engine oils. Maybe that is the direction..
GM had a TC wear problem with the DOHC 3.6 litre six in the Enclave, Acadia family and increased the oil change frequency, but don't think they call for synthetic..
In my experience motor oils do not "go bad", but do get contaminated with dirt/metals, combustion products/acids and gas etc., and over time no doubt the viscosity improvers break down, but typically soot will make the oil go thick..
Our 2007XK will likely be seeing Rotella T6 in its future, but the next oil change will likely not be this year, maybe just the filter..

 

The oil is not the problem.
The chain, tensioners, guides, etc. are the parts that fail and result in engine damage due to jumping a tooth or two and throwing off the timing. Then "KABOOM!" as metal pistons meet valves and score cylinder walls.

 

I think we have some people obsessed with debating oil change intervals. Gents, not once have I mentioned here that oil change is the solution. It certainly will help and not hurt. But I dont want to discuss it as it would be the least of our worries.

I think we should talk discuss filtration. There are ways of filtering oil down to 5 microns- the damage causing particles that oil is no longer able to suspend.

Also some people have rabidly attacked the source of this study. First of all, there are two independent studies here, then if you want to use Google, look up 'soot GDI' you will find studies from several universities and scientific institutions- then you will see the magnitude of this problem.

 

That's an odd reply.

If wear is occurring and causing timing problems and if that wear is due to contaminants in the oil... you'd expect Jaguar to know and to be recommending more frequent oil changes.

Which is what people asked - are Jaguar recommending them or not?

 

"Some owners may wish to have their engine oil changed more frequently than required, should the vehicle have a high proportion of short journeys or operate in severe conditions. These extra services may be performed on a customer pay basis and the Service Interval Indicator will not be reset."

Jaguar Vehicle Servicing and Maintenance | Jaguar USA

Your Passport to Service defines the conditions which fall under "severe service."

 

There are no spin on filters currently available to filter down to 5 microns, as most paper filters are 30 micron, and synthetic materials 10 micron. Remember that's 5.0 micron, and soot is in the 0.005 micron range. Soot is in the nano-micron arena. It's the load of soot, that not only increases viscosity, but becomes a abrasive, and basically bypasses any filtration, since it's size is too small to be captured. The next issue is acids, which is where the oils TBN reserves come into play. The only way to deal with this, is through the change of oil.

Also be aware that most spin on oil filter's bypass valve is generally less than 1 bar or 14 psi, (most are 8~10 psi) and the differential pressure between pushing oil through the media, as opposed to going through the bypass can lead to large quantities of unfiltered oil to be pumped through the oiling system, especially when oil viscosities begin to increase because of various conditions like shear, oil contamination through atmosphere and combustion gases. This also, can only be remedied by a shorter schedule intervals. With what the industry calls "tea-cup" sized oil filters, and the increased load placed on oil, using a filter for 15k miles may lead you to running thousands of miles with oil completely bypassing the filter media. And the limited size of that bypass, due to design, can severely restrict the quantity of oil, causing starvation.

Chains are not a direct oil pressure item within current designs, (unlike crank or camshaft bearings) but only oil splash lubricates them. Oil and filter choices, and frequency of changes play a vital role in wear and longevity.

 

Jaguar did not have a clue this is why timing chains have suddenly started lasting shorter, neither did any of the other manufacturers. Precisely the reason for countless independent studies.

Jaguar will never admit they have a problem, neither will any other manufacturer. Look no further than current class action settled by Honda. Its cheaper that way.

As per recommending shorter oil changes- they wont do that either directly. For one it would put them in a different class of polluter, and more costly to maintain. They are trying to prove the opposite.

 

David,
What about spraying oil on the timing chain through the oil fill port, if starting car from a one week rest. Using a spray bottle or oil squirter?

My suspicion is the chain is not get oil quick enough. And its under higher load than conventional designs.

 

Timing chains have always been one of the weaker links in engine designs, and, as seen in conventional V designs, direct drive is one way to eliminate this issue. However, this distance between overhead cam design and the crank doesn't create an easy method to utilize a direct gear drive design. So we are stuck with link and roller chain designs. I truly think we could be on the path to a better valve control design with solenoids, but the technology and reliability to do this, is still a little ways off.

The big thing is to understand the oil we have to choose from over the counter still leaves a lot to be desired. It's why I use Group V esters, and detergent fortification. It's what Jaguar's attempts to find a better additive package from BP/Castrol to help in what is essentially another way to do what I have been doing for decades. And change frequency plays a vital role in removing soot and acids from the crankcase of the GDI equipped vehicles.

"Also, oil changes are extremely important. Customers should always use the manufacturer’s specified oil to prolong the life of GDI components such as the high pressure fuel pump. If the wrong oil is used or the vehicle does not follow the manufacturer’s recommended oil change intervals, it may result in the failure of the high pressure pump or of other GDI components." (and most extended drain intervals, which we are finding, is not aggressive enough)

https://theshopmag.com/features/qa-a...ipped-vehicles

 

As a matter of fact, engine design devoid of timing chains has already arrived in racing cars.

Formula One engines no longer have camshafts, thus do not need any drive system for rotating camshafts. Inlet and exhaust valves are operated via electro-hydraulic, hydraulic or pneumatic systems with the latter being the preferred method pioneered by Renault and Valeo.

Due to the proximity of the camshaft to the crankshaft, pushrod engines can utilize a gear-driven mechanism rather than a chain to turn the camshaft, but due to the additional need for more moving parts, lubrication may still be an issue at higher RPMs.

Given the advances in F1, I believe it is only a short time until the electro-hydraulic or hydraulic valve actuation design filters down to vehicles designed for consumers.

 

As long as poppets are utilized, high RPM will require spring rates that don't lend themselves well to most of the designs today, including oscillation. A rotary valve configuration could facilitate high speed, without the spring requirements of the poppet, to control mass. But as of now, I don't see current designs being brought to mass market for at least another decade. More adventurous designs, like Bentley's V12 cylinder layout could provide a good base for rotary valve heads, but most concepts are still only on paper.

http://www.coatesengine.com/csrv-advantages.html

 

Very interesting article, thanks.

On a side note, it states that the Spherical Rotary Valve system will mean that oil change can occur every 50,000 miles. Oh Lord, if what you say is true and we this in 10 years, the oil change debate will really go into overdrive with 50k recommendation!!!

 

I really like this one, if these become available, I would be interested in making custom heads to fit them:
FreeValve | FreeValve Technology

 

After having my timing chain tensioners, timing chain, and all 4 actuators replaced I'm SOLD.... That was a 28k miles and with yearly recommended service!!!

Box. Please reply either here or pm me what you do with specifics but in lamens terms EXACTLY how you manage your oil changes, oil, and additives. So far I think I understand more frequent oil changes (not 1 yr and/or 10,000 miles) and adding BG's MOA every oil change or ????

 

When I see the odometer hit 5~6 thousand miles, I look for a nice weekend to do a change. For me, that averages twice a year. I add one can of MOA during the fill. Most dealers carry it, but can be ordered online as well. Match oil weight to the temps you average during the period. (winter use or summer use) The owners manual, or the Passport to Service can help you decide this.

Concerning filters, I would personally recommend Mann, Purolator PureOne, or Mobil1. Build quality, filter media performance, and design are top shelf on these. Concerning oil, I only use full synthetic, and Jaguar is recommending Castrol w/FST, and the only other company right now with that same additive from Afton, is Kendall GT1 w/Ti, but for me, I look for one that fares well in NOACK deposit test. Both Castrol w/FST and Kendall GT1 w/Ti do excellent, as does Mobil 1 EP and Shell/Pennzoil Ultra Platinum. For the 5L, I would gravitate towards the Afton Ti additives that Jaguar is recommending. MOA only complements these, and makes just about any oil King Kong of protection.

 

There are no choices for the 5.l engine.

There is only one kind of filter and one kind of oil.

The trick is to make Absolutely sure that your shop is using the right oil. (let me explain) This oil Castrol will absolutely not sell to any mechanic- regardless of quantity. Its for Jag dealers only.

Simple.

If you want to DIY- I can show you a proper alternative.

 

Formula One engines do not use 'poppets', springs nor camshafts. The valves open and close via computer controlled pneumatic pressure.

The CSRV design, while innovative, still requires a great number of moving parts and mass.

The OP was providing information on timing chain lubrication and wear factors, so having an engine design that removes the timing chain mechanisms may be one direction to go in for future vehicles.

 

[QUOTE=
This oil Castrol will absolutely not sell to any mechanic- regardless of quantity. Its for Jag dealers only.
.[/QUOTE]
Actually, I just did my own oil change with the Castrol Pro Edge that I bought from a local dealer. It was $8.11 qt. I've seen it 1 place on line for about $11/qt. So much for Jag dealers only..

 

You misunderstood. Castrol does not want to sell this to independent service shops- that will compete with Jaguar.

Yes you can buy at retail all you want, as I do.

My warning was dont let a oil change place tell you they used used the correct oil, they cant get it.

 

Hey Guys, You wont believe this; came across this totally accidentally.

"My shop has switched to 0w20(Castrol Edge Pro E) on the 5L engines completely(unless 5w20 is requested by a customer) and I personally use it in my own engine.