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HTHS for "normal "duty #5434745 05/21/20 02:59 AM
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gusgeds Offline OP
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Hi just a question for our experts. Would there be any difference in measurable wear rates at normal operating temps between a car speced to run 5/20 hths @2.9 and an engine speced to run 5/40/ [email protected] both oils being Gp 3 synthetic and meeting SN spec with both engines operating inside safe working temperatures?

Re: HTHS for "normal "duty [Re: gusgeds] #5434748 05/21/20 03:08 AM
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userfriendly Offline
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Until an expert comes along, I'll just say no. A HTHS of 2.9 is on the thick side for a 5W20, and 3,5 the thin side for a 5W40.
For example, my 5W40 Delo 400 is around the 4.1 HTHS mark.

Re: HTHS for "normal "duty [Re: gusgeds] #5434814 05/21/20 06:51 AM
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BMWTurboDzl Offline
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Only those who designed the engine in question would truly know that. As a layman IMO there would be no difference. Some high performance engines are spec'd to run 20w up to 40w.


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

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Re: HTHS for "normal "duty [Re: userfriendly] #5435261 05/21/20 04:41 PM
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CR94 Offline
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Originally Posted by userfriendly
... A HTHS of 2.9 is on the thick side for a 5W20, ...
Yes, practically a 30.


2011 Toyota Prius now at 110K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: HTHS for "normal "duty [Re: gusgeds] #5435536 05/21/20 11:55 PM
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ChrisD46 Offline
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Most 5W20 are 2.7


'17 Hyundai Sonata 2.4L GDI 5W30 PUP / Fram Ultra #9688
'10 Hyundai Elantra 2.0L 5W30 (50%) / 5W20 (50%) QSUD / Fram Ultra #9688
'07 Kia Sedona 3.8L 5W30 Castrol EP / Fram Ultra #9999
Re: HTHS for "normal "duty [Re: CR94] #5436061 05/22/20 04:58 PM
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ledslinger Offline
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Originally Posted by CR94
Originally Posted by userfriendly
... A HTHS of 2.9 is on the thick side for a 5W20, ...
Yes, practically a 30.


I think Redline 5W20 HTHS is 2.9, or has been in the past. I'm running it in my 2003 Silverado that calls for 5W30. The oil pressure appears the same as 5W30s I've run in the past.

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