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post #6 of 8 (permalink) Old 23rd August 2010 Thread Starter
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Re: Motrio Engine Oil - good or bad compared to Castrol

wow, hit a good debate here, thanks for both replies, I'm starting to follow the 10,000 mile oil change or 18 month interval whatever comes first, like I did on this oil change. The oil came out black, so black.

I use to follow the 18,000 mile oil change recommended by Renault, and used Castrol, but I think this is way to long, don't know why renault recommends the following:

36,000 for a Fuel Filter / Air Filter change, should this not be done maybe 20,000 miles

18,000 / 18 months for an Oil Change - should not this be 10,000 or every year
4 Years for Coolant flush / Brake fluid flush - should this not be 2 years?

thanks for the input guys.
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post #7 of 8 (permalink) Old 23rd August 2010
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Re: Motrio Engine Oil - good or bad compared to Castrol

Here is my opinion/experience on the subject. I worked for the MoD for about 7 years testing oil companies submission samples against an MoD specification to see if they passed. I was also a certified 'rater' of pistons after a test.
Basically the MoD would request quotes for say 1,000,000 gallons of oil to meet the specification.
Oil companies would specially blend the oils to meet the spec.
Anyway the oil companies would submit a sample and give the MoD quote for the oil . We would then test the oil in a european standard test and rate the results.
The oils would nearly always pass the test by between 0.5 and 1%. The maximum deviation that was allowed in 'testers' was 0.5% !!!

So basically the companies blend the oil to just pass the tests. The most expensive parts of oil are the additive package.

There is one very important thing that should be known. Fully synthetic oils are so much better than normal mineral oils as the additives are chemically bonded to the base oil . So when oil is burnt off, with a synthetic oil its just a volume of oil that is lost, with a normal oil its the lightest parts of the oil (the additives) that burn off, leaving just the base oil .
Dont bother with semi synthetic as that is just a bit of synthetic mixed with normal oil . Not worth it at all.

Bottom line is get a synthetic oil that meets or exceeds the spec that the manufacturer requires. I always go for the cheapest synthetic oil that meets the spec that I can find. Change filter and oil an a max 10,000, make sure you cool the turbo before turning it off. i.e. let it idle for 30secs to 60 secs depending on how hard you have worked the turbo . That way the oil flows thru the turbo and cools it back down and doesn't boil in the turbo when you switch it off.

Sorry for long post.
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post #8 of 8 (permalink) Old 24th August 2010
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Re: Motrio Engine Oil - good or bad compared to Castrol

In my view we can discuss the quality of engine lubricating oils and the quality of such but many people tend to forget that engine oil has two important jobs to do.
Firstly it has to be able to lubricate all internal components as soon as possible when starting and provide sustained lubrication at all times and temperatures.
Secondly it has to provide adequate cooling and heat dispersal. Coupled with this is the efficiency of the coolant system so maintainance of this system is equally important.
Some oil may be better at this than others but at the end of the day the efficiecy of the engine lubrcation system has it role to play. There's no point in using a top of the range oil in a poor system or vice versa.
It also has to be remembered that an engine oil that looks perfectly clean doesn't mean that it hasn't been contaminated by the combustion process. And regardless of the quality of the oil if its contaminated it can't perform properly.
My policy is to change the oil every 8,000 miles or every 12 months whichever comes first and use a medium priced oil which meets the criteria for your engine but fit the best quality filter you can afford.
At the end of the day I feel that regular oil and filter changes are more important than using a higher quality of oil than is necessary. Also if you use economically priced oil you can then afford to change the oil more often.
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