2008 Jetta S 2.5 , VW 502 oil specs are met by Moble1 synth 0-40W, 5-40W, 10-40W. Back in the day of one weight oil, the standard philosophy was the hotter the driving conditions the heavier the oil used. End of problem. My question (which I’ve had since synth came out) is now with these multi vis…

When looking at multi-viscosity oils ie: 5W-30, the first number, 5W is the winter weight of the oil. This is the viscosity of the oil when the engine is cold so that the engine is provided with lubrication is soon as possible when it’s started. Once the engine reaches operating temperature the oil …

OK, good info. But, It is rarely cold here in FL. Would my engine be better protected with the 10-40W as apposed to the 0-40W ?

I would have purchased 10-40W based on this/ my understanding but typically difficult to find the 5 or 10-40W. So I purchase what I can at the time I have available to change. Also, when on sale at Auto Parts, with filter.

... Moble1 synth 0-40W, 5-40W, 10-40W The 10W-40 grade is intended for those who live in tropical or semi-tropical climates. The other grades are also acceptable for Florida residents.

Does you owners manual have anything to say about this? Some have a diagram with a temperature range and the different viscosity recommended.

Mobil 1 10-40 is not VW 502 approved . Here’s a list of oils that meet that spec . [image] Volkswagen Oil Standard 502.00 / 505.00 Approved Oils Visit the post for more.

Genex, your list is for the GTI, which has that nifty turbo. The OP is driving the tamer Jetta.

Google “Viscosity Index Improver” and how they work to understand what is going on here…

The VI’s reading is interesting. Yes, part of my dilemma is that I do not have an owner’s manual so I must sift through information listed in various sources

The list of oils that meet vw502/505, this is also interesting that the 10-40W was not listed here, I’m sure I found it listed elsewhere. But this is my concern, is that the 0-40W is not appropriate even though listed in many sources. 0W just seems like “zero protection”

Synthetic Oil! 0-40, 5-40, 10-40

Maintenance/Repairs

genex May 20, 2012, 9:50pm 9

Mobil 1 10-40 is not VW 502 approved .

Here’s a list of oils that meet that spec .

Topic		Replies	Views
40W thicker than 20W-50 The Show	16	30556	October 6, 2011
Use of 0W40 oil in engine that calls for 5W30 -Bad or good idea? Maintenance/Repairs	34	135777	January 24, 2018
Oil viscosity Maintenance/Repairs	19	3564	January 30, 2012
Oil weights and Florida hot weather Maintenance/Repairs	34	81046	September 9, 2018
Finding the Correct Oil Maintenance/Repairs oil	22	4437	August 10, 2015

Synthetic Oil! 0-40, 5-40, 10-40

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