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#130424 - 05/01/05 04:11 AM Re: I am tired of everybody saying 20 wt oils exist only for gas mileage
moribundman Offline

Registered: 06/02/03
Posts: 23591
Well, would 75 in a minivan climbing the mountains of central PA on I-80 qualify??
Absolutely! [Smile]

#130425 - 05/01/05 05:44 AM Re: I am tired of everybody saying 20 wt oils exist only for gas mileage
427Z06 Offline

Registered: 12/06/03
Posts: 7409
Loc: Austin, TX
Originally posted by 427Z06:
When testing a non-friction modified 15w40 HDEO and a friction modified dino 5w20 in particular engines, my experience has been that when they have non-friction modified 15w40 HDEO in them, they reached operating temperature is less time. My guess is, they were burning more fuel to maintain the same idle and moderate acceleration levels, thus the engines were generating more heat.

I just like to add to this, that once up to temperature, the friction modified dino 5w20 stabalized at a lower temperature than the non-friction modified 15w40 HDEO under moderate driving conditions.

#130426 - 05/01/05 01:06 PM Re: I am tired of everybody saying 20 wt oils exist only for gas mileage
mechtech Offline

Registered: 08/11/04
Posts: 2387
Loc: Chicago area
Dr.A - Just because the pressure is the same doesn't necessarily mean that one oil is thinner/thicker/the same, than the other. The pressure gauge reads from the pump and relief valve operation, and the oil may be thinner at the cams, rings, bearings, where heat and pressure have great effect.

#130427 - 05/01/05 06:31 PM Re: I am tired of everybody saying 20 wt oils exist only for gas mileage
AEHaas Offline

Registered: 01/09/05
Posts: 1320
Loc: Sarasota, Florida
If the oil leaves the sump at 180 F and maybe picks up 10 degrees on its way to the bearing it would be at 200 F at the entrance to the bearing. If if then picked up 50 F there it would end up at 250 F.

The thicker oil starts out at 240 F at the sump, picks up 10 and then 50 more through the bearing. It ends up at 300 F.


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