Thickest oil you've ever used.

[6lbsoft]

Back in high school I had a 1980 GMC K25 with a 350 that leaked everywhere. Instead of changing the oil pan gasket I just ran Valvoline racing 50wt =). My buddy also had a 1988 Jeep Cherokee that had low oil pressure. That got Kendall nitro 70wt lol.

 

[Olas]

Thickest I've used is 20w50 as per the OM recommendations

 

[bsmithwins]

20w50 in an air cooled BMW bike as per the manufacturer.

BSW

 

[Chris142]

Sae 60 valvoline in my 2.5L jeep. And tons of 20w50 through out my early life.

 

[FCD]

20w50 as per the owner's manual is all my car has seen for most of it's life.
Might try some Penrite 15W-60 or 20W-60 in the future just to try.
Nothing compared to some guys Down Under who have used 40W-70 oils!!!.

 

[Kuato]

10w40. For awhile had a hard time changing over to 5w30.

 

[Kira]

20W-50 as per maul '85 Subaru 1.7l.

 

[Nissan101]

SAE 50 on my dad's 1992 Nissan sentra

 

[Quattro Pete]

10w50 in my bike (2013 BMW F700 GS).

 

[demarpaint]

5W50 Mobil 1 many years ago.

 

[Nickdfresh]

20W-50 in an old Mazda/Mercury 1.6L that called for it in summer. 10W-40 was the overall preferred oil in cooler temps...

I also used 15W-50 Mobil 1 in an older Accord...

 

[BrocLuno]

Castrol RS 10W-60

 

[Lolvoguy]

75w90

86 Nova. Consumed oil so I used this to slow consumption

 

[aquariuscsm]

20W50 as per Z32 fsm. Did a uoa and it came back perfect.

 

[CharlieBauer]

With gas at $2 gallon, 20w50 could be the new bitog thang!

 

[Lolvoguy]

Originally Posted By: Lolvoguy
75w90

86 Nova. Consumed oil so I used this to slow consumption


The best part was listening to the crankshaft struggle to churn that goop in -30C temps with no block heater.


To this day I'm still amazed at the abuse that car took....and kept going!

 

[vitez]

20W-50 in an air cooled 911. Took too long for the oil pressure to come up so changed back to 10W-40.

 

[Red91]

20W-50. Still my second favorite grade after SAE 30.

 

[Jetronic]

20w-50 Red Line. 6.1 cP HTHS

 

[Merkava_4]

20W-50 Exxon Superflo in a 1978 Cadillac Sedan DeVille 425 c.i. (7.0L) V8.
Engine ran smoother and got better gas mileage as opposed to 10W-30.