Mobil 1 differences?
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CLK 350
Mobil 1 differences?
Changed engine oil and filter today on my wifes CLK350 and used Mobil 1 Extended Performance 5w-30 instead of the Mobil 1 European formula 0w-40. Is there any cause for concern or are the two oils similar enough that I can leave it in for the recommended interval? We only drive about 6000miles a year on the car so oil is changed by time. Thanks
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Joined: Jun 2008
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From: Atlanta Metro
2008 clk550 - Navigator - Frontier
I am not sure, but would bet that the "extended performance" oil is not a "full synthetic" oil. The "extended performance" will break down differently and leave more "sludge" (primarily due to the temperature range additives and the dino portion of the mix). But I don't think this will be an issue over one oil change cycle.
If you drive aggressively, you should probably change to the full synthetic after 3-4 K miles. If you drive "normally", I think you will be ok to go 5-6 K miles before changing back to the full synthetic Euro formula.
BTW - it does not have to be 0-40. 5-30 (full synthetic) will be ok unless you live in a really cold place and the car is not garaged.
If you drive aggressively, you should probably change to the full synthetic after 3-4 K miles. If you drive "normally", I think you will be ok to go 5-6 K miles before changing back to the full synthetic Euro formula.
BTW - it does not have to be 0-40. 5-30 (full synthetic) will be ok unless you live in a really cold place and the car is not garaged.
MBWorld Fanatic!
Joined: Jun 2008
Posts: 1,227
Likes: 61
From: Atlanta Metro
2008 clk550 - Navigator - Frontier
You're right on the viscosity. My "5-30" was a mistake..... I intended 5-40. The viscosity of 40 will make a difference, particularly for the "speed demons" out there........ (guilty)
