0W-20 oil or 5W-40 oil
0W-20 oil or 5W-40 oil
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Discussion

Mr Miata

Original Poster:

1,215 posts

68 months

Yesterday (23:12)
quotequote all
Hi, I m wanting to do an oil service on my own. And torn between which oil viscosity to use.

The manufacturer recommended 5W-40 oil for the pre facelift cars and then one year suddenly changed their recommendation to 0W-20.

Having gone down a rabbit hole on other forums. Some people claimed the manufacturer only did this to meet MPG fuel efficiency targets. And the thinner 0W-20 doesn t have any other benefit. Some even claimed the thinner oil can be detrimental for high mileage / highly stressed engines, as it offers less wear protection.

What do you think? Is this a wacky conspiracy theory and I should stick to the manufacturers recommendation of 0W-20? Or should I use the thicker 5W-40 instead, if I want to keep my car forever and run it into the ground? Thanks.

The cars a VW Golf. With the 2 litre EA888 engine. Around 60,000 miles.

Dave.

7,746 posts

271 months

Some good info on here....




E-bmw

11,521 posts

170 months

Mr Miata said:
Hi, I m wanting to do an oil service on my own. And torn between which oil viscosity to use.

The manufacturer recommended 5W-40 oil for the pre facelift cars and then one year suddenly changed their recommendation to 0W-20.

What do you think? Is this a wacky conspiracy theory and I should stick to the manufacturers recommendation of 0W-20? Or should I use the thicker 5W-40 instead, if I want to keep my car forever and run it into the ground?
Definitely a "whacky conspiracy theory" they want you to wear out your nice (newer) engine & then buy another, of course you should use the thinner less-protective oil.............

the-norseman

14,702 posts

189 months

FIAT/Alfa did a similar move with the 1.4 Multiair engine.

Mine is one of the later Euro 6 engines and needs the 0W oil.

Sheepshanks

38,175 posts

137 months

Not sure where 5W40 comes from - the alternative was always 5W30.