Fast_Freddie

iTrader: (50)

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.

typac69

iTrader: (42)

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

Fast_Freddie

iTrader: (50)

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

Robevo RS

iTrader: (16)

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.

Fast_Freddie

iTrader: (50)

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

Fast_Freddie

iTrader: (50)

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

bluebanana23

iTrader: (26)

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

Kracka

iTrader: (49)

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

Gary@MellonRacing

iTrader: (74)

what about mobil 5w 50

boosted9

iTrader: (3)

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

sparky

iTrader: (1)

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.

nothere

iTrader: (23)

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.

sparky

iTrader: (1)

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

HxllxMan

iTrader: (6)

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.

sparky

iTrader: (1)

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.