Monday, Jan 13, 2003 at 21:56
Peter, you are correct in what the manual says about not using CG rated oil. I have researched 'why not' extensively and result on oils is surprisiing to me in that 'latest spec is not the best' for the motor. CG4, I believe, is for low sulphur diesels, of which australia has not made mandatory. CG4 will not provide the protection against sulphur related residues that CF4 will provide. Also, phosphorous is being reduced in latest spec oils and this additive reduces wear. Why is it being reduced, same reason lead was taken out of petrol.
I live in
Darwin and at times I can smell the sulphur dioxide in the diesel exhaust fumes. Do synthetics at extended drain intervals protect against this??? I dont know. But I do know that our fuel specifications are different to european markets where extended oil drain intervals are used.
At the end of the day, I now believe my mate who has been using Valvoline XLD in ALL his engines, petrol and diesel, for the past 10+ years with 'exception' results.
As for synthetic, I use it in petrol cars that run at extended high load but thats all. I have yet to see an oil sample analysis that proves that synthetic results in less wear under normal operating temps at scheduled service intervals. I have seen
test results that show that BMW branded oil, which is not latest spec oil, providing same protection as synthetics.
Its hard to get the facts, just my humble opinion on this issue that I still do not fully understand.
Sean
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