Mopar It
NAXJA Forum User
- Location
- windsor nor-cal
whats required to swap my normal motor oil to full synthetic?
Haleyes said:Drain the old.
Put in the new.
I usually use 5W30.Mopar It said:you use mobil 1 full synthetic? what weight in a 4.0?
The color of an oil is mostly a function of how much carbon gets past the rings and into your oil. The quality of the oil has little effect on this. The better oils are good at suspending the particles in the oil and carrying them to the filter, which can make an oil appear dark. Also many oils are sort of dark to begin with. Basically only a proper spectrometric analysis can tell you for sure the condition of your oil.yossarian19 said:You ought to be able to tell how well an oil is performing by checking its color at a given mileage, no? Using straight dino oil, mine was blackish by 3000. Semi synthetics look clean to me at 4K. No grime to suggest mechanical wear or color change suggesting heat breakdown.
If semi-synth didnt have the additives or if synthetics in general didnt (synthetics being a prime part of the synth blend) have the additives to keep an older engine running smooth, then wouldnt you wind up with MORE crud in the oil and not LESS?
jeeperjohn said:Drain and pour. You will want to go to a slightly heavier grade if you are concerned about seals leaking. My personal choice is Mobil 1 because it's $5 per quart at Costco. I have also used Castrol syntech. Basically any name brand synthetic is fine.
Correct. Same goes for alot of the sythetics out there. The only Mobil 1 I'll use now is 15w50 extended performance formula. It still has high levels of Zn and P. But my got to is Amerilube 10w50. I'll also use any diesel 15w40 with a ci-4 rating or earlier in a pinch.Vince said:The anti-wear additives in lubricating oil have changed in the last few years to improve the efficiency of catalytic converters in modern engines. Mobil-1 is no longer the same as Mobil-1 of 10 years ago.
The Jeep's 4.0L pushrod motor needs a traditional mineral oil (or semi synthetic) that contains similar antiwear additives that were once available in top branded oils at the end of the 90's. I now only use 10W40 oil that is labelled 'formulated for older engines' or 'formulated for diesel engines'.