Oil for 1990 Mitsubishi Montero 3.0 liter?

[OceanRuns]

Seeking oil recommendation for a 1990 Montero with the 6 cylinder 3.0 (6G72). 130k miles. Previous oils used are unknown.

Considering 15w-40 Delo 400, 10w-30 Delo 400, and 10-40 Mobil 1 high-mileage (all available at local WalMart, and all have elevated ZDDP - although unsure if that's even necessary). I have the usual concern that the synthetic Mobil 1 may enhance any existing leaks (haven't noticed major ones, but haven't had the rig long either).

Or, other ideas?

Most of the vehicle operation will be in 35-85 degree whether. Although, lows in the 20s and highs a bit over 100 are occasionally possible depending on where I am.

 

[901Memphis]

Yes the manufacturer allowed many different grades for that model, I really like the Mobil 1 HM 10w40 for your climate and application.

 

[OceanRuns]

Originally Posted By: 901Memphis
Yes the manufacturer allowed many different grades for that model, I really like the Mobil 1 HM 10w40 for your climate and application.


WalMart here sells that for $26 and change for a 5 quart jug.

 

[Run]

I had the exact same engine in a couple of old dodges. They seemed to really like Pennzoil yellow bottle 10w-30. Do check the main seals when you change the timing belt. Those motors are major leakers.

 

[aquariuscsm]

Originally Posted By: Run
Pennzoil yellow bottle 10w-30.


I'd use your fave brand mineral oil in 10W30/10W40. My Mitsubishi 3.0's "hated" synth oils. Made them noisy and rough. Smooth as silk on conventional.

 

[artificialist]

Higher ZDDP isn't that important for your truck. It typically only is needed on OHV engines with aggressive cams. You have a SOHC engine.

 

[Branson304]

I vote for Mobil 1 High Mileage. It definitely won't make your leaks worse.

 

[Falcon_LS]

Assuming this is a 12-valve, Mobil 1 High Mileage would do - the valve seals on those, particularly the earlier models, harden over time.

 

[bigt61]

MaxLife blend - coupons.com still has instant $10 off two jugs at Walmart. For $12+ for a 5 qt jug, that tough to beat. If you already have an existing leak, I'd stay away from any synthetic, even M1 HM.