Royal Purple also makes a 10w40 as well.
Is 10W40 obsolete ?
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European 10w-40s like DuraBlend typically meet ACEA A3, the same spec we look for a 5w-40 synthetic to meet.
I think I`ll be using it in my 97 Tahoe with 340.00kms for summer use.
My Celica uses 10w-40
Lsst time I checked 10W40 was the biggest selling viscosity here.
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Originally Posted By: sprintman
Lsst time I checked 10W40 was the biggest selling viscosity here.
Ewes guys finally started going thin?
Lsst time I checked 10W40 was the biggest selling viscosity here.
Ewes guys finally started going thin?
my fiat use it 10w40
If your car is spec'd for 30 grade, the engine is designed to run on 20 grade because dino energy conserving 5w-30 usually thins to 20 grade so I think yes, 10w-40 is obsolete for NEW cars.
Use 10w-40 in a car like mine(170,000 miles) to compensate for increased clearances in the bearings.
Use 10w-40 in a car like mine(170,000 miles) to compensate for increased clearances in the bearings.
I believe it boils down to what base oil is used. The "old" 10W40s were Group I base oils with a lot of easily shearable VII. In Europe the 10W40s marketed for trucks are severely hydrotreated Group III oils, basically quite similar to PAOs except synthesized from crude petroleum.
http://www.autokreso.hr/ulja/downloads/kamioni_mobil/Mobil Delvac XHP Extra 10W-40.pdf
http://www.epc.shell.com/Docs/GPCDOC_X_cbe_24855_key_140002137790_935.pdf
The VII needed to make this base oil 10W40 is relatively shear stable.
OTOH 15W40 HDEOs have been and are made out of Group I, II and II+ base oils. It has apparently been determined that the widest viscosity spread attainable ensuring shear stability with Group I oils is 15W40. Or 10W30.
Obviously a Grp. II+ oil (i.e. Delo 400 Multigrade) will have less VII than a Grp. I for the same viscosity.
Charlie
http://www.autokreso.hr/ulja/downloads/kamioni_mobil/Mobil Delvac XHP Extra 10W-40.pdf
http://www.epc.shell.com/Docs/GPCDOC_X_cbe_24855_key_140002137790_935.pdf
The VII needed to make this base oil 10W40 is relatively shear stable.
OTOH 15W40 HDEOs have been and are made out of Group I, II and II+ base oils. It has apparently been determined that the widest viscosity spread attainable ensuring shear stability with Group I oils is 15W40. Or 10W30.
Obviously a Grp. II+ oil (i.e. Delo 400 Multigrade) will have less VII than a Grp. I for the same viscosity.
Charlie
I`ll use Pennzoil yellow bottle 10w40.
That PYB 10w-40 has an HT/HS of 3.7 which would make it A3. It's a good oil. I'm running havoline 10w-40 right now in the sbc because it was on sale for 5qts. + filter for 12.99. 10w40's have a better spread than 5w30. They usually shear to a heavy 30w which is right where most cars like it.
Plus they have a slightly higher add pack.
Plus they have a slightly higher add pack.
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