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Andrew S

5 40 or 5 30?

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On a 530D is there any downside to using 5 40 instead of of 5 30?

I am sure there were comments about the lifters wearing on cold start when cold with thicker oil? 

Would 40 make it quieter LOL?

Cheers

Andrew

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Thinner oil flows better and will reach components quicker after a cold start

 

Thinner oil causes less drag so will make the engine (marginally) more efficient

 

Thicker oil however will probably result in a quieter engine

 

However when we're talking about 20 year old cars it makes next to no difference - I wouldnt worry too much as the differences are small. If it seems to run better on 5W40 then just use that

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The short answer to the original question is "no". I switched to 5W40 some years ago on my 525d and change the oil and filter every 6000 miles or so. The car is now on 227000 miles. I doubt that there is much discernible  difference between 5W30 and 5W40 in practical use but 5W40 is cheaper and we experience higher temperatures here.

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Thanks All

 

My main concern was due to the fact that on my old E34 525 I have to have the followers replaced due to a couple of tappets that drove me made and the last thing I wanted to do was knock these ones out with cold starts with a 5w 40 oil. With 150k miles as said, there should not be an issue then

 

Cheers

Andrew

  

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