Which cars specify 10W-40?

[hominid7]

Quote:

---

Quote:

---

IIRC, my 1981 Honda Accord owners manual only allowed 10w30 up to something like 90*F and allowed 10w40 across all ranges.

I used Pennzoil 10w40 and never had a problem for 160,000 miles.

---

That's interesting; I wonder if it's because the 10W-30's of the day were only good up until 90 degrees Fahrenheit.

---

What's more interesting is my 1989 VW Jetta (gas) only allowed 10w30 and 10w40 up to 50*F, and allowed 20w50 up to 86*F, and over 86*F recommended ONLY straight SAE 40 or SAE 50.

I thought this was insane, but sure enough, the thinner oils would make the oil pressure warning lite buzz at me. So i ran valvoline AC 20w50 year round and had no problems for over 200,000 miles. I mean NO problems at all. The only thing i did was replace the valve cover gasket once at 150K. It wasn't leaking, rather just barely weaping a bit, but i wanted to play it safe. When i replaced it, the valves were all spotless. It never burned any oil, then again, even back then i changed it *very* often. I think there is something to be said for a simple 8 valve 4 cyl design.

When i sold it i had to really force myself to use something as 'thin' as 10w30 in my new mazda.

 

[OAS]

The company that rebuilt my Bronco 2's 2.9 V6 suggested 10w40, and recomended Pennzoil, but said to keep 10w40 in there.

That seemed very odd to use in a newly rebuilt engine, but then again we live in the "high desert" area of NW NewMexico.