Hi all. A quick question. I have an unopened 5ltr can of Penrite HPR 10 10w/50 fully synthetic in my garage. Would this be ok in my V12 I know I need 10ltrs. I have been using mineral 20w50 which has been fine but it’s now time to change the oil ready for its winter slumber. What you guys reckon​​​​​.
Rob.

 

Yep.

I run 15W40 Semi Syn all year round in all but the PreHE, it gets whatever is on special, due to leaks I am NOT touching @ 655000kms.

 

Hi Grant.
Ok to use synthetic after mineral. I seem to remember reading that some say it’s not a good idea. Im not sure why.
Rob.

 

I think the advice is the other way around. Its ok to go from mineral to synthetic but not from synthetic to mineral. However, I have no idea if that's true or not.

 

Many, many moons ago I went to synthetic...and then returned back to conventional. Nothing bad happened.

[shrug]

What ill result is supposed to occur, I wonder?

Cheers
DD

 

10w50 should be fine, especially if there's some wear in the system - but you're gonna need more than 5 litres.

The synthetic 'debate' is one of those internet myths that just won't die. I have yet to see any results from a test by any reputable body that confirms or denies. You see a lot of speculation or amateur evidence (conjecture) that could just as easily be attributed to the day of the week with as much certainty as the claims made. If you don't change the oil for an eternity and throw a nice new oil in complete with various cleansers then it will dislodge stuff irrespective whether it has a dinosaur origin or not.

I've used fully synthetic everything in all my classics for year with zero problems, the only thing I watch is the viscosity, although the 0w or 10w doesn't mean what most think it does, it is the second number that's the most critical as this is the 'viscosity' at normal operating temperatures.

It depends how cold it gets where you are, the number pre the W is viscosity at -18C I wouldn't go lower than 10w in any event. I run all but one of my classics year round on 10w40 Ester full synthetic. (I have one that I run on 20w50 when it isn't in bits)

 

No issues.

Like Warm beer after Cold beer, its still beer at the end of the day.

Remember this engine is from the Mid 1950's, think about it, not too hard, it will be fine.

 

The Penrite was left over from my Range Rover P38 days so I thought I might as we give it a go.
Rob.

 

The only downside to the plan is that the V12 takes 10 litres .... I'd recommend you don't mix grades so see if you can find more the same - don't forget the top up bottle

 

Already got some more on they way😀
Rob.