ILSAC GF5

[4WD]

Bought several Mobil 1 six packs at Costco - helps me top off behind the Walmart jugs.
Changed Cruze just now with 2 x 5w-30+ 1 x 10w-30 and 1 x 5w-30 HM ... (Leak started at 67k)
Only the HM was not ILSAC GF5 ... Is that typical or could it be an older six pack ?

 

[vronline]

Typical

 

[SR5]

That M1 HM is good stuff.
At the thick end of the grade, with higher HTHS and higher zinc. A good performance oil.

Regular M1 5W-30 has a HTHS of 3.1 and 900 ppm zinc, while M1 5W-30 HM has a HTHS of 3.3 and 1100 ppm zinc.

Not ILSAC, but a very good oil, to my mind the M1 HM oils are the pick of the bunch.

 

[4WD]

Good info - the PP looks to be leaking faster from my 5.3L GM at rear seal - so I could start rolling in the M-1 HM next change @ 62k - bit early in theory - but a 2010 that see's on/off work ...

 

[Gene K]

Originally Posted By: 4WD
Good info - the PP looks to be leaking faster from my 5.3L GM at rear seal - so I could start rolling in the M-1 HM next change @ 62k - bit early in theory - but a 2010 that see's on/off work ...


Basically it has to much of the good stuff ZDDP to be GF5. Think of it as Poor Man's Redline.

 

[BrocLuno]

And Maxlife HM (red bottle) is the poor mans VR-1