I changed the oil last night to Mobil1 15W50 (OEM filter). Says its for primarily turbo'd/supercharged engines. So far so good, I live in WA so not too cold here in the winter, plus my car is garaged. I searched last night before I put it in, but the only people complaining about it were people with newly build engines and when they put it in the rod bearings failed. I want opinions for people running this on stock engines.

 

I run this on my stroker motor and its definitly good stuff..

 

Not a stock engine... but I will let it slide....

 

if its too hot out there.
But i would use it only for track. Like road course or something is longer then 14 sec.
And soon as you come off change it.

 

^ The only thing I got out of that post was use it only for the track and change it afterwards...

 

So only 2 people use mobil1 15W-50...?

 

15w-50 increases oil temps while decreasing power on stock engines based on a respected tuner on this forum.

 

Too thick for the stock engine. Mitsu designed their tolerances around the recommended oil so thats really your best bet.

 

what about mobil 5w 50

 

the viscousity is too thick for the stock motor. i think the engineers design the motor to run on 10w30 or 5w30

 

I used to run this weight(5W-50), but only in the hotter summer months here where I live in the Tropics. I stopped using it altogether because it made my lifters tick. Then I switched to 0W-40 Mobil1, but I feared that it was too lighweight for the hotter summer months. I would never run 15W-50 on the street. In fact, I wouldn't use it for the track either. I would use Motul or European Castrol 10W-60 preferably for track(road racing) rather than 15W-50.

Now I use European Shell Helix Ultra 5W-40, or, Motul 300v Power, 5W-40, for street driving year-around. If I lived where there are cold winters, then I would run Mobil1 0W-40 during the colder months.

I don't advocate any one particular brand of motor oil over any other. If I lived in the U.S., then I might try something different. If I lived in Britain, for example, then I might run Fuchs Silkolene Pro S 5W-40, or some such. But, since I live in a 3rd world country I must accept the lack of variety in motor oils. The best motor oils available here in my country are: Motul, and Mobil1, as well as European Shell.

 

sparky, oil gurus,

I'm a little confused by the oil rating system, maybe you can help me out.

I'm left over from way back when, when a 20 weight oil was for the winter and a 30 weight was for the summer. What I don't get is what happens with a 5 50 oil.

I understand the 50 as being good for hot engine running, as in road course.
I understand that a 10w is good for operating in cool temps and for getting high mpg.

What I'd like to think is that a 10w 50 would have the properties of a 10w in cool situations and a 50w when things get really hot.

Is that the way it happens?

Lets figure the best synthetic oils.

 

Thanks. But, I am not an oil Guru, or any sort of shaman either. I too am from way back when we would put straight Castrol GP 50W into a 4-stroke bike engine, and 20W-50 Castrol GTX into your car. Remember those days, huh? LOL

 

Motul V300 10W40 or Mobil 10W40 on a 2.3L is good for track/drag.
To thick is no good for stock.

Unless you run Gr.N rally. All mitsubishi in Europe run 10w40 - 15W50.

 

Nothere: One thing to watch for, which I have read about is that on multigrade oils, you should be wary of the ones that have too wide of a viscosity range, such as let's say a 5W-50 or a 10W-60 for extended change intervals.

Why so? Well, in layman's terms(my language), it is more difficult to maintain these widely disparate viscosities as a uniform blend. The oil companies are forced to use a more complex additive package to maintain consistency. After prolonged use these additives,: such as stabilizers, extenders and etc., tend to fall out. Once they fall out, the oil's value as a high performance lubricant is zilch, eventhough it may still appear to be good.

So just be wary of those extremely wide viscosity ranges.