Matt Bachand
Depends on the 6.5
Advance Auto parts, 5 quarts of mobil -1 and mobil -1 filter for 29.99.
I picked up 10quarts, and 2 filters for 62 bux.... can't beat it.
I picked up 10quarts, and 2 filters for 62 bux.... can't beat it.
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They had a similar deal at Autozone last month. However, Autozone doesn't carry the diesel-rated Mobil 1.
-Rob![]()
I know It's probably meaning less and maybe the stuff is differnt now but I have always had a bad taste in my mouth from that stuff. My Father back in 1977 bought a brand new F-250 from Ford. He ran nothing but Mobil one in it and the timing chain went at 45k and then the engine around 55k. he blamed the oil. Of course I was about 15 yrs old so who knows if that was what really killed it.
Synthetic oil has come a LONG LONG way in the last 10 years, not to mention 30.
And IIRC Made in USA. (Hopefully from someone who gives a damn)
I have stayed away from the synth stuff all together Just because ?????????/
Old school I guess.
The 94 Burb (still have it) had been run with Amzoil HD diesel marine or ?? or some such since it was new.
When the head gasket blew at 237K (Ebay purchase at 230K) I did a complete O'Haul and the engine looked good inside but the pistons, bearings and crank were no better than I had/have seen from rigs using regular petroleum based oils.
Bearings showed wear into a couple layers in the upper rod shells and lower main shells.
Nothing outstanding that would convince me to run out and buy the Synth oils for the extra $$$$$
Just my 2 cents worth
Here's the real deal with my expereience. When you hear how LIGHTING FAST, and QUIET START your 6.5 engine will crank over and start when its cold out with synthetic, it will make you a believer and you will never subject your poor engine to pumping heavy thick DINO again.
Not to mention a tad more turbo whistle, meaning the synthetic oil is doing a better job lubricating the turbo, all while maintaining better thermal breakdown properties, and SUPERIOUR cold flow.
I'm not pushing it on anyone, just saying it IS a night and day difference in cranking speed, and quieter diesel clatter.
Matt, what do you use, where do you buy it? My problem is how terribly expensive it is. Even at Autozone/Advance, it's still going to cost me $60 plus to do the oil change, and with Delo, it's only around $25. Given that I change it out every 2500-3000 miles, it's pretty spendy.
-Rob![]()
Matt, what do you use, where do you buy it? My problem is how terribly expensive it is. Even at Autozone/Advance, it's still going to cost me $60 plus to do the oil change, and with Delo, it's only around $25. Given that I change it out every 2500-3000 miles, it's pretty spendy.
-Rob![]()
I agree, big difference even only as low as 10F. At -10F or less it is truly amazing.
What you need to consider is the ability to extend drain intervals with many synthetic lubricants.
If you are going to change oil at 3k miles, using synthetic is a complete waste of money IMHO.
If you choose to use oil analysis and extend drain intervals based on lab results, synthetics make a lot of sense, even more so if a bypass filtration unit is installed.
There are many benefits to synthetic lubricants as a whole, many of which have been mentioned already in this thread.
The drawback is the cost. This cost can be in many cases completely absorbed in the overall reduction of the number of oil changes while providing reduced operating temperatures and superior protection.