Some thoughts about cruising speed and oil viscosity

[Genie47]

I have just realized this and also in part from our dear Tien's usage of 5W20 oil in our climate.

 

If you frequently cruise at 3kRPM (around 110+kph). A 40wt oil is pretty good for you.

 

If you frequently cruise at 2-2.5kRPM (around 80-90kph), a 30wt oil is pretty good for you.

 

If you drive really really slow constantly stuck in traffic jam, short distance runs. A 20wt oil is good for you.

 

If your car got 6 gears, woohoo! Can use 30wt oil for cruising at 110+kph because the RPM is lower.

Edited May 4, 2005 by Genie47

[Trex101]

You mean if go NSH, min must use 40wt oil? I had been consistently using 30wt or 20wt oil since i bought my car 3 yrs ago, never seem to have any consumption problem at all. Probably the above usage guideline are only for mineral oil.

Edited May 4, 2005 by Trex101

[Pauly75ts]

"A 40wt oil is pretty good for you."

 

Looks like I'll have to use 60wt oil.

 

Rgds

 

Paul Yong

[Genie47]

Yours of course 60wt. Your car from that era and also run so hot better take 60wt.

[Genie47]

But the problem with high temperature and synthetic oil is not high temperature stability. It is fuel dilution. I still remember the 5W20 high speed run last year. >4% fuel dilution is no joke. The oil thinned until the petrol was getting into it.

[Pauly75ts]

"Your car from that era and also"

 

Must be an error to drive it for another 7 years.

 

Rgds

 

Paul Yong