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how many miles between oil change

heavyduty guy

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heavyduty guy Enthusiast

heavyduty guy

Posted
Posted

hello iam new here so if this has been ask before i am sorry but i was going to start running mobil 1 in my 6.0 and maybe in my wifes tahoe and wanted to know how many miles i could run before an oil change i have always changed oil at 3000 miles and also my truck has 3200 miles on it and the tahoe has 9200 miles is it ok to switch over to syn oil and also what about the mobil 1 oil filters i see they cost about 10.00 is it worth the diff over the regular 4.00 filters thaks

tmf6902 Senior Enthusiast

tmf6902

Posted
Posted

The opinion around here is that you can switch to synthetic anytime....I did it at about 27K, but you can do it sooner....there are cars that come off the line with synthetic in it. You shouldn't have any problem.

JayMan Enthusiast

JayMan

Posted
Posted

The motors are well broken-in so switch to a good synthetic. You indicated you want to run Mobil 1 and that's fine.

 

Your oil change intervals should be based on common sense: the oil filter is the limiting factor, not the oil. In my commercial Cummins equipment I run the OEM primary oil filters and Gulf Coast bypass filters with Mobil Delvac 1 5W-40. I change the filters as recommended but only do an oil change if the Used Oil Analysis recommends it.

 

Unless you put in a Bypass oil filter system like the Amsoil combination head with primary/bypass, the primary oil filter will quickly plug. I wouldn't try to get more than 4,000 miles out of the filter before changing it. Remember the primary filter will barely filter out the 25 micron trash, the smaller stuff gets through.

 

At the very least, don't be afraid to go until the Driver Information Center informs you to change the oil. If you're worried about the filter, and I would be, change the filter every 3,000 miles.

 

Due to my extreme climate conditions, I change the oil twice a year: Mobil 1 0W-30 winter, Mobil 1 10W-30 summer. I change the filter every 4,000 miles in summer, every 2,000 miles in winter. This summer I'm going to switch to a bypass system and run Mobil Delvac 1 5W-40.

JayMan Enthusiast

JayMan

Posted
Posted
i also have a work van with 145ooo miles on it would it be practicle to change it over to syn with this high amount of miles?

145,000 miles? Hmm, I don't know.

 

The theory is that the "regular" motor oil has already left behind deposits on the seals, say rear main and front crank. Synthetics have MUCH higher detergents than regular oils, which is a big advantage from new (Keeps motor clean, extended oil changes, etc).

 

You switch to a synthetic at that many miles, and the synthetic could dissolve the deposits already left behind. You might get leaks at the rear main, front crank, valvecover gaskets also appear to seep when you make the change.

 

In HD diesel equipment, changing from a regular 30 or 15W-40 to a synthetic like Mobil Delvac 1 after high miles tends to knock the soot inside the motor loose. You tend to plug filters quickly, and plugged galleries have happened.

 

I'd use careful judgement. Is this beast in good shape? Worth keeping??

heavyduty guy Enthusiast

heavyduty guy

Posted
  • Author
Posted

everthing is in great shape but if i can get 3 more years out of it i will get a new one the van is a everyday driver for me but my hd i had it since july and it has 3200 on it

JayMan Enthusiast

JayMan

Posted
Posted

Well, if the van has 145,000 miles on it, use caution. I'd just worry about you putting synthetic motor oil in something with that many miles on it and you suddenly have leaks from the rear main or seeping valve cover gaskets.

 

If the truck has 3,200 miles on it, might as well switch over now.

Machine Enthusiast

Machine

Posted
Posted

I run Mobil 1 in all of my gassers...I use Rotella Synthetic in my diesel. I run them all 5K miles between changes. No problems, ever.

 

However, I do know of a few high mile vehicles that did develop leaks after switching...that could be because they're "high mile vehicles" and have nothing to do with the switch. I would hesitate switching at 145K miles.

Roofer Senior Enthusiast

Roofer

Posted
Posted

I used Mobil1 10-30 in my 5.3 gasser and changed it when the change oil light came on(normally about 5K). On my Dmax I use 15-40 Rotella non-synthetic and change every 3K (change oil light comes ona at about 8K). On the PSD I use 15-40 Rotella non-synthetic and change it about every 5K. No problems on any of them.

Dmax-28K

5.3 had 65K

PSD-85K

I use Napa Gold (WIX) filters.

AlanTDickey Enthusiast

AlanTDickey

Posted
Posted

I plan on starting to change my own oil when I can, but often do not have time (I's sure some don't believe, but my work schedule is really insane and I have a new baby on the way, etc....). My question is: When asking (and paying) for Mobil-1 with various oil-change services and even dealerships, are you really likely to actually get Mobil-1? How common is it for them to just pour some other crap in there and say "they'll never know"? [i apologize for the cynicism.]

Roofer Senior Enthusiast

Roofer

Posted
Posted
I plan on starting to change my own oil when I can, but often do not have time (I's sure some don't believe, but my work schedule is really insane and I have a new baby on the way, etc....). My question is: When asking (and paying) for Mobil-1 with various oil-change services and even dealerships, are you really likely to actually get Mobil-1? How common is it for them to just pour some other crap in there and say "they'll never know"? [i apologize for the cynicism.]

I can't trust a business that operates on quantity instead of quality. Most places use what they have in their barrels. If it is a garage that actually works on vehicles it may be different. In your situation, the best way may be to buy the oil for them and bring it with you.

There is no way that anything catastrophic could happen to your vehicle by using a regular oil as apposed to a premium synthetic, so why would they spend the extra time and money for an average customer.

My dad takes his truck in and asks for blended oil, and who really knows if they use it or not.

 

In your case (and I'm sure you'll agree), I think time with your family and your job is worth more than what oil goes in your engine.

Just my opinion. NO pun intended. :rolleyes:

Machine Enthusiast

Machine

Posted
Posted

The place that I go to to have my oil changed (Kwiklube) only carries Mobil 1 in quarts. The rest of the oil is Penzoil in barrels. Regarding my diesel: I have to bring my Synthetic Rotella to them and they change the oil for $20. I usually watch these guys do the oil changes on all my vehicles - they don't mind, and I know it's getting done the right way. In and out in 20 minutes

timk49 Enthusiast

timk49

Posted
Posted

I would not recommend beginning to use Mobil 1 in a vehicle with 145,000miles. I had a 95 Silverado with the 5.7 engiine. At about 80 , 000 I put synthetic oil in it. within a couple thousand miles I had leaks at the valve covers, and the rear main, and the oil cooler hose connections. I don't think all of those leaks were just from age.

 

I have used Mobil1 in my new truck since the first change. I use Wix filters.

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