LC100 Castrol/Mobil Synth S
Submitted: Thursday, Apr 24, 2008 at 10:47
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I have a petrol lc100 (6 cyl) which I serviced at Toyota up until 140,000km. They used Castrol FMX/Magnatec (I understand Magnatec is the retail equivalent of FMX). I never had to top up the oil up until this point. At 140,000 I change to a local mechanic who used
Mobil Synth S. Between 140,000 and 150,000 I had to add 3 litres. No
sign of leaks so it’s going out the exhaust pipe. The mechanic is at a loss as to why, as is
Mobil tech support. Wondering if anyone else has had something like this ? Synth S is supposed to be good but I'm thinking of trying castrol again.
Reply By: Bushtrek - Thursday, Apr 24, 2008 at 12:31
Thursday, Apr 24, 2008 at 12:31
You have a classic problem of changing to what you/or the mechanic thought was a better product "because it is synthetic or part synthetic".
A great myth, that no amount of explanation to the contrary will convince, some people to disbelieve.
A very real possibility exists that the
mobil product contained too much volatile base fluid and what you see as oil consumption is in fact the base fluid evaporating out of the system during use. Yes, it is going out the exhaust via the rings into the combustion chamber, also out the PCV system into the same destination.
The oil is a vapour by the time it transfers into the combustion chamber.
You would be better of using the Castrol Magnatec 10W-40
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Follow Up By: Member - Olcoolone (S.A) - Thursday, Apr 24, 2008 at 15:10
Thursday, Apr 24, 2008 at 15:10
Have to agree with Bushtrek, alot of people think synthetic or semi synthetic is the bee's knee's...sure it is good but in the right application.
Nearly all hi tech deisels use a semi synthetic now due to the extra load placed on oils and longer service intervals.
Most non synthetic oils are very good and work extremaly
well.
I doubt very much if the average person could tell if the oil they are using is working good or bad.
Just because you go through oil quicker than some other brand does not mean it is cr%p.
Much the same as people using oil additives.....WHY?
The only thing you are helping is the person or company who sells it.
Im sure alot of people who say brand X oil is no good and you should be using brand Y only do so because they don't want to be like everyone else and use brand X.
Regards Richard
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