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Discussion Starter · #2 ·
The best engine oil to use is Castrol magnatec. This eliminates the hydraulic tappet noise(unless they are totally shot).
You should really be changing the AYC fluid on a 4500 mile service also.
This should be done at your local dealer as your hydraulic fluid also needs changing on your AYC system which requires the MUTester to perform the operation.
 
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Discussion Starter · #3 ·
I wouldn't presume to say that Magnatec is the 'best' oil to use but if people have used it sucessfully for the tappets then fair enough (I haven't).
I would just say use the best fully synthetic 10W30 (or similar 10Wxx grade) oil you can find. Magnatec is probably the most readily available but also consider AMSOIL, Red line, Motul (expensive though), Mobil 1 etc.

If your gearbox oil hasn't been changed within the last 10,000 miles then I would also change it. It's a simple job and will cost you only £30 if you do it yourself. Just use a decent quality (GL5 spec.) gear oil rated at 75W90. Castrol Universal Syntrax is quite popular and I have used it in the past to good effect although now I am going to go fully synthetic. Also consider changing the Transfer box and Rear diff oils at the same time as the Gearbox oil. They require a GL5 spec. Hypoid gear oil.
 
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Discussion Starter · #7 ·
It's the wrong grade , Mitsubishi recommend 10w30 synthetic , and I had a discussion with Redline (I use this brand) and they advised 10w30 even in the American Western climate.
The thicker is better thing is a common misconception with motor oil.
 
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Discussion Starter · #8 ·
And so what's wrong with Mobil 1 (5W/50). I've been using it for 10 years now on turbo charged mitsubishis. My latest experiment of nipping tappet noise in the bud at cold start ups seems to have worked (oh and always keeping the oil on or just above max. level).
 
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Discussion Starter · #9 ·
There's nothing wrong with the Mobil 1 5W-50. I've used it on my Scoob and now on my EVO. No noisy tappets, no oil consumption even when used on track (and in the wet;)). Also several Rallypreps I spoke to use this oil in their competition engines. I won't use any other oil in my motor.

Cheers

Mike
 
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Discussion Starter · #10 ·
due to the way multigrade oils are made you are better to have a lower spread of viscosities (10w-30) rather than a higher one (10-60). This is because the manuafacturer will have had to put in alot of additives to give the large spread of viscosities. These additives are not so stable as the base oil and its therefore better to avoid using these if possible. AMSOIL and Mobil1 have no viscosity improvers in their 10w-30 oils. I would probably use Mobil 1 although at the moment Mitsi are doing the servicing due to warranty.

checkout www.vtr.org/maintain/oil-overview if you want to be as boring as me....
 
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Discussion Starter · #11 ·
My Evo 6 is going into Mitsubishi for a service tomorrow and they have said that they use 15w40 fully synthetic oil. When I queried this, they said that they could use a semi-synthetic 10w30. Which one should I tell them to use?
 
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Discussion Starter · #15 ·
My local Mitsubishi dealer stated Ralliart insisted they used Castrol RS - but my evo taps for 30secs or so on cold start

When I had my Escort cosi they insisted I did not use mobil1 someting to do with the turbo and recomended RS
 
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Discussion Starter · #16 ·
The oil Mitsubishi dealers use varies a lot as it depends who their suppliers are and what they stock. They won't use a particular oil brand simply because it is known to be the best for Evo's.
All I can say is pick a good oil, buy the oil yourself and take it to your dealer for them to use when they service it. Stick with the oil you have chosen as swapping brands about all the time can possibly lead to problems (anyone remember the Duckhams problem?) Above all you WILL save money this way.
 
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Discussion Starter · #17 ·
But which is a good oil for Evos? I thought that castrol RS 10-60 was one of the best oils in the world, but Evoboy has told that It has a wrong grade.

Bye
 
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Discussion Starter · #18 ·
evowilly,
Castrol RS is a good oil , but not the best and not the correct grade 4 an Evo. Use 10w30 synthetic such as Redline or Amsoil.
As Oli said above oils , with a wide viscosity range have a big proportion of Viscosity Improvers in them , these r basically long chain polymers which shear down (cut in2 smaller pieces) as the oil is used , ultimately the oil will degrade down 2 the lowest number in the grade if not changed soon enuf or the oil is subjected 2 alot of severe service.
Redline and Amsoil 10w30 don't have any VI improvers in them 2 degrade.
Most race cars use single grade synthetic oil 2 eliminate degrading , they also don't need multi-grades because they don't have 2 worry about cold and stop start use.
U need 2 remember that Castrol and Mobil spend a huge amount on marketing , this is subtle brain washing I'm afraid and we all fall victim 2 it 2 some extent.
 
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