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Old April 8th, 2011, 2:38 pm   #1
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Default Oil grade? (5w30 vs 10w40)

I know this has been asken a million times and I've looked through the topics, but you guys in the bigger world seeem to have different grades of oil than us here in Finland, North Europe, so I want help on making a decision on which oil to use; (meaning we don't basicly have 10W30 which seems to be the recommendation)

The engine is F2T (Ford Probe), stock boost and basicly no mods, but I will start adding some mods when its good stock condition.


Valvoline Maxlife 10W40, for engines driven over 60k miles. The one which I preferred if there's no difference cos' I use it on my Protege 1.8 DOCH BP and been happy with it in that car

or


Ford Formula 5W30, apparently a very good oil for Fords and other cars that may use 5W30

Both are good oils & about the same price (good value too), the main concern is the viscosity, 5w30 or 10w40?

Probe is a summer only car for me and in the summers we have ambient temperatures of 60 F to 90 F (15 C to 30 C) on an estimate.
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Old April 8th, 2011, 3:05 pm   #2
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Usually, 10W30 vs 5W30 is a question of climate.Based off of your 60-90 degree range I would typically recommend 10W30. It's surprising to hear that that isn't available over there though. I've heard of people using 10W40 in older engines with some wear without a problem, but I also know a good few people used 5W30 on this site as well. Also the Ford F looks to be a synthetic (I prefer synthetics), but the biggest question is how many miles do you have on the car?
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Old April 8th, 2011, 3:24 pm   #3
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its probably because at winter it gets crazy cold here & ppl are too lazy to pick their oils for that, so they choose 5w-30 for all around. there are about 2 brands I dislike selling 10W30 for big ass overprice so its basicly not a choice.

well the cars been driven about 80k miles according to the dashboard, but theres no telling if its accurate or not, the vehicles been bought from Germany and they tend to screw with the mileage over there. There's clues from it being accurate and some clues that are against it, so there's not really telling, but I've a feeling it might actually be accurate or close to it.

So, 80k miles.
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Old April 8th, 2011, 3:34 pm   #4
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If that's the case, I'd personally go with the 5W30 Ford F synthetic of the two you mentioned (assuming your engine seals are tight and not leaking anything).

Cheers!
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Old April 8th, 2011, 9:22 pm   #5
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thanks for the opinion. I'll probably try them both and try to feel it. The turbo leaks a lil bit to the intake, I don't know how much but there were a few drops of accumulated stuff between a connection I recently opened.

So, let's pretend I had a modded and had boosts like 11psi, would the 10w40 be more reasonable then? (as the engine would deal with more heat)

I'm kinda lost with the guidelines since they sell stuff like "20w50 turbo racing oil" and I always thought they use special oils like that in a turbo car so the oil doesn't get too thin in hotter (vs N/A) conditions, but then I discovered turbo cars use pretty much the same oil as the N/As i've been working with.
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Old April 8th, 2011, 10:44 pm   #6
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Not a problem. I just noticed that you said you have 80k miles... For some reason I was thinking 80k km. With that in mind (and the fact you have an oil leak), I'd steer clear of synthetics. Maybe get that high mileage stuff in the 5W30.

Cheers!
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