Originally Posted by Mikey

True- but high ZDDP levels are not required in our engines- it's older stuff with flat tappets that are at risk. Current API spec SM is more than acceptable for our engines.

Originally Posted by Cerberos

I run old cars, 1936, 1950 and 1954 so I like 1400 ppm to keep the tappets and cam from scuffing.

Originally Posted by oldmots

I have had three Jaguars I bought new, the 06 XKR , the 05 XJ8 and a 96 XJ6 that I sold a few years ago. I have always used synthetic in the new ones and run it for 10,000miles. I have a 96 XJ6 that I bought new and used conventional oil in it, changed every 10,000 miles as per the manufacturer. This engine had heavy reddish residue coating all the internal parts from scorched friction modifiers and the engine was filthy inside. The two cars with synthetic show clean metal and look new,even with 80,000 miles. It is sure proof to me, synthetic oil is superior and more temperature stable. I can't understand the reluctance of some people to use this proven superior product. I always guessed that they just can't handle change or something. I will say that when draining the oil, the synthetic looks just as black as the conventional oil, but if you look in the engine, there is a different story.

Originally Posted by Kevin D

You clearly misunderstood what I said and what I intended. I was responding to one of the posters who seemed to say that since one type of oil was not as dark as the other, then the lighter oil must be better.

Let me clarify it for you. All things being equal, or being driven the same number of miles, if one particular oil is darker than another, then the darker oil is removing more carbon and other contaminates from the engine and cleaning it better, and that is why it is darker.

YES, we ALL KNOW that the "darkness" of the oil is not the correct way to judge its true condition.

Some of you people get into such a hissy about oil that these threads often have to be shut down.

Just put the recommended oil in your car and change it in the recommended time or mileage period and you are very unlikely to have an engine problem related to improper lubrication.

Originally Posted by randyb

Dang dude, do not take it so personally and I was not in a hissy, just stating facts as I see them.

Originally Posted by Mikey

I bet that if cars could hear and talk, they'd be killing themselves laughing at the emotions that erupt over oil discussions.