Advise please,
I have bought a 1996 XJ6 Vanden Plas; previous owner used Castrol motor oil.
My other non - Jag car runs on synthetic oil and I am thinking of changing the Jag to synthetic oil at the next oil change.
But not knowing a lot about Jaguar enjines I will stay with Castrol if advised to - what would the group recommend,?
Thanks for any advise given.
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I have the same plans for my XJ40 3.2 from 1992, so I am also interested. Both cars have the AJ6 engine as far as I know. I am running on a semisynthetic 10W-40 for the moment, but think that a fully synthetic must be better, but probably not necesarry at all...
Leo
Twenty years ago there was a general warning around that stated you shouldn't convert to synthetic oil if the car had more than 10,000 miles on it, run on conventional oil. It was thought that synthetic oil would tend to leak past seals worn in with regular oil. I hope someone has more up-to-date information.
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I hope you mean 100000 miles, after 10000 miles you have just finished breaking in the engine... If a synthetic oil has the viscosity prescribed for the engine, I don't see why it should pass any seals that a conventional oil doesn'r pass ?
Leo
Exactly the point.
Funny reverse saying I heard was that once you put a car on synthetic oil you can't go back to a regular oil or it'l ruin your engine. Are these "urban legends or really based on fact?
I have a motor oil bible for anyone interested. It's rather large 3.18 MB
The main reason you should change your oil at the recommended intervals is not because the oil has "worn down" but because it gets dirty from carbon deposits and other impurities that make their way down into the oil pan from the combustion chambers. The actual lubricating properties of any oil are thus diminished because these carbons create friction on moving parts. The oil filter helps, but it gets saturated very fast and notwithstanding most manufacturers claims, most impurities go right through it.
You can go out and spend a lot more for a quart of synthetic oil and it will not be any better on your engine than a good regular oil like Castrol. Both oil types will get dirty after about 3,000 miles; and the dirt is what damages your engine.
Unless you are driving a racing engine at over 10K RPM for long periods of time, you will never generate enough friction and heat to break down a good regular oil.
So, save your money and get the Jaguar factory recommended Castrol GTX 10W-40 or
20W-50.Regular oil is just about the most easily recyclable consumable there is. Oil recycling centers just filter the carbons out and re-sell it with the same lubricating properties as regular oil.
JP Engineering Products Investigations Nissan North America, Inc. Nashville, TN.
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Thanks for the information, much appreciated, I will stay with Castrol oil as recommended.
Thanks for the information, much appreciated, I will stay with Castrol oil as recommended.
Good choice.
I have a 92 VandenPlas with a LOT of mileage. I've never used any motor oil other than the factory recommended Castrol GTX 10-40W and the engine is still going strong.
Synthetic oils withstand higher temperatures before breaking down, and have more base stock and less viscosity modifiers. However, synthetics wear out, become acidic, and eventually become saturated with suspended soot particles, just like regular oil.
And finally, I recommend you do your oil change. It's not that difficult and you'll avoid trouble. For some stories on Jiffy Lube, check this out:
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