Mitsubishi 3.5 liter DOHC 6G74 issues?

[Pajero]

Hello, it is with great enthusiasm that I follow these threads. I have a 94 Montero SR 3.5 liter DOHC 6G74 Engine.

Are there known issues concerning the oil? For example, my friend has a 07 FJ cruiser. His FJ is really hard on oil. I have used Valvoline, Mobil 1, and RP with no issues. My Montero is clean and does not burn oil and is garage kept. My Montero is a secondary vehicle and not a DD.

Is my Montero known to be hard on oil? Any opinions would be greatly appreciated. Once I have two consecutive OC using Pennzoil Ultra I will have a used oil analysis done.

The Owners Manual recommends for normal driving oil changes at 7,500 miles and oil filter every other oil change.

95% of driving is highway and the other 5% is four wheeling at times...However I live in the desert, so its really dusty. Thanks in advance......Do good

 

[147_Grain]

Older Mitsubishi engines suffered from more headgasket and hardened valve seal issues that most manufactures. Engine isn't hard on oil, just tends to suffer more leaks than others.

 

[chubbs1]

You can't do much better than you are doing, with a quality oil like that and a good oil filter just follow your owners manual.

 

[dparm]

I LOVE the old Monteros. The last of the truly rugged SUVs...

 

[Falcon_LS]

Originally Posted By: 147_Grain
Older Mitsubishi engines suffered from more headgasket and hardened valve seal issues that most manufactures. Engine isn't hard on oil, just tends to suffer more leaks than others.


That mainly applied to the 12-valve version of the 6G72. Then again, with improved seals and the use of a quality synthetic, this isn't a major problem to overcome. My 6G72 with 244,000 miles barely consumes anything between 7,500 mile intervals with Pennzoil Ultra 5W-40.

The 6G74 is a solid engine, and I'd be more concerned about your air filter than your oil. Personally, I drive in dusty conditions and replace my air filter every oil change. Other than that, keep up with your timing belt and fluid changes (including coolant) and this is a bulletproof engine.

Depending on what transmission you got in there, these aren't exactly high capacity units. I would be very conservative with ATF changes, and use a synthetic at shorter intervals. Don't forget the transfer case and the differentials.

 

[147_Grain]

Agree.

Mitsubishi engines tend to need more TLC maintenance that most engines.