Originally Posted By: Finz
Niero... I only hope the feedback I've given you even close to correct. I think it is but, again, most of what I've stated has been gleened from the real experts on here and a few google searches
Refer to this link:
Widman
You can input your mixtures here and it will calculate for you the resulting cSt. Or, further below on the page, you can input each oil's cSt and what cSt you want, and it will provide you with the proportions of each
Go to Valvoline's website:
Valvoline
Click on the MaxLife HM and then click on that oil's Product Info pdf
Note that the cSt for the 10w-40 at 100 centigrade is 14.9
I really need to double check this but I'm fairly sure that MMO's cSt at 100 centigrade is 2.6... Again, I found this a while ago in the Virgin Oil Analysis section of BITOG... You can confirm this value as well
Here, too, confirm this, but my quick look around tells me that either 10W-30 or 10w-40 is widely used by others driving your car
KCJeep also suggested using 10w-40 if you were to mix with MMO
Refer to the MaxLife PDF again and note that the 10w-30 cSt at 100 is 10.7. Since this is a popular oil for your vehicle, that will be the benchmark for the cSt.
Now, go back to the widman page and enter those figures:
First oil: 14.9 from Valvoline PDF
2nd oil: 2.6 from MMO VOA section of bitog
Desired: 10.7 to match cSt from MaxLife PDF for the 10w-30 and then hit calculate
You should be using 83% 10w-40 MaxLife and 17% MMO to get the same cSt as MaxLife 10w-30 (I rounded the numbers and would go 85/15 or so)
With regard to running 5w-30 since you've owned, we are now in an area where I can't be of any help to you at all, unfortunately, as I don't know jack about jeeps
I forgot how this started to be honest and I'm not being a smart-arse, but what does the manual call for?
You might consider reviewing the Used Oil Analysis section on bitog and keep paging thru until you find a few listings from guys with your vehicle or you could PM some guys in here who list jeeps in their signature.I'd guess that there are scores of Jeep forums on the net you could take a peek at. Or just go to the PCMO section here and create a post asking which oil is best: indicate what you currently use, you cars mileage and any know problems or issues, the climate, the kind of driving you typically do... All that good stuff. And then duck - you'll probably get dozens of responses and recommendations
Then just start reading thru this forum... Pick a subject and just start looking around. It will blow your mind how much these guys know and how much there IS to consider about oil and stuff
As for changing your own oil, I'll bet there are a thousand + YouTube videos on how to do this and, although a lot dirtier, it's on par with changing a light bulb.
Get a bucket and a wrench/support the car/ pull the plug and wait for oil to drain/unscrew &replace oil filter/put plug back in/fill with oil. Actual "work" time:10 minutes plus time for oil to drain
Here in NNJ, having a shop change synthetic oil, figure about $60+ Doing it yourself, once you have the tools, worst case $30
For 30 minutes work, you have $30 extra your pocket...
Best of luck and happy reading
--bob
Thanks, Finz. That is good info and I really appreciate the explanations. I've been doing a little research and I'll take a look at that link you posted. Based on what you and others on here have said I'm definitely going to make this a short OCI. I may end up changing the oil within a week, to be safe. We'll see.
Regarding running 5w30 since I've owned it (in the previous engine), I definitely won't be doing that. Maybe in the winter since it gets pretty [censored] cold up here but from now on it will be 10w30 or w/ an engine treatment like MMO, 10w40, at least.
Thanks again