Changed to syn oil at 48,000 mi, too late ?

[magothy1]

When I bought the syn oil a guy at a parts store said I had too many miles on it to change over to the synthetic.

I know I'd read about not changing oils on high mileage engines, but I don't think 48 thou is high. Any thoughts ?

 

[lethal injection]

I dont think thats to high. Heck they suggest we dont switch over till 20000 anyways.

 

[jnelson]

I swithced to amsoil (ran it all the time in my '01) around 200,000. doing great. extended my drain intervals to 10,000 miles. the oil is designed for at least 15,000 but I work her pretty hard. I'm an amsoil dealer now so i run everything I own with amsoil.

 

[ANG012]

Switched my 97 over at 44000 and I have 175000 on it now and never had any problems yet.

 

[jimnance]

First, as a medium duty diesel expected time between overhaul should be 300,000 + miles. Your truck is really just nicely broken in. While I'm not a big fan of synthetics because of cost vs benefit, I don't see any reason why you couldn't switch. It should have no negative effects on your truck. Maybe your wallet though.

 

[ddutil]

IMHO it's the right time: your engine is perfectly broke-in.



For the wallet issue: I use extended drain intervals + bypass filter + oil sampling at the same overall cost than dino oil changes. With the benefit of saving on fuel (1-2 liters per 100km x 35000 km = $500 CDN per year). It does pay off for me, and for the environment (2-4 times less oil!).



Dan



See your friendly Amsoil dealer for details

 

[BHaden]

Sounds like yet another example of an "expert" spreading old myths about synthetic

oil. I've put it in everything I've owned for the past 25 years, new or used, regardless of mileage and never had a problem of any kind. You're fine.

 

[DieselFiend]

jimnance, it really works out to be about the same. Extending your oil drains means you only change your oil half as much. With regular oil, i'd change it every 4 to 5 K. With AMSOIL i'm going 10 K with good samples coming back.

 

[magothy1]

Thanks for all that, guys, I had a feeling he was a self appointed expert. I made the switch partly to save time laying in the yard, and partly because an old gearhead friend of mine says the syn is better stuff. He makes nickels scream, he holds them so tight, he uses the stuff, I was convinced.

 

[CHolman]

Got the truck with 70,000 miles on it (switched to Royal Purple) www.longrider.com have 115,000 miles now...

 

[navyjoe]

I bought a 98 12v at 80,000, switched to synthetic and traded it at 155,000. Still running great. changed every 10,000 miles anyway even though oil sampling indicated it wasn't necessary (it cost less to change than to sample). I did add a amsoil bypass filter.

 

[gsbrockman]

a guy at a parts store said I had too many miles on it to change over to the synthetic.

The guy at the parts store probably *thinks* Ford owns Cummins, too. :-laf



Greg

 

[WhiteSheep]

The parts guy got this backwards. In general, depending on how you drive, you want at least 20k on a diesel and 5k on a gas before switching to synthetic. Synthetic oil will not break in an engine correctly because it doesn't allow the bearings to wear in. I switched to AMSOIL at 30k on my 04. 5. The only problem is that synthetic oil will find a way to leak out of little holes that dino juice won't find. No leaks yet on the Dodge, but my 98 Jeep spits oil occasionally.



The cost evens out if you extend your drain intervals. With all my vehicles on annual oil changes, I don't get to spend as much time on my back in the garage as I used to. This leaves more time to play with my toys, not work on them.

 

[RobertP]

48k i wouldn't think twice about it. no worries. most good synthetics have a swelling agent to make sure you dont get leaks.

 

[RMalone]

I am no expert on anything but growing plants for profit, but I don't think it would hurt an engine to change oils every single change, dino, synth whatever as long as the oil meets specs. Amsoil even claims that you can mix their oil with dino oils just don't expect drain intervals to be as long.

 

[AGissel]

I thought these trucks, the '05 at least, came from the factory with pure synthetic and thats why they take so long to break in and get decent mpg. I'm getting ready for my first oil change at 7k and am now wondering if I should use amsoil or dinosaur oil.

 

[amsoilman]

When I bought the syn oil a guy at a parts store said I had too many miles on it to change over to the synthetic.

I know I'd read about not changing oils on high mileage engines, but I don't think 48 thou is high. Any thoughts ?

48,000 miles on your truck is not high mileage! I have installed Amsoil synthetic in many trucks and cars with more mileage on them than that.



Wayne

amsoilman

 

[GHarman]

When I bought the syn oil a guy at a parts store said I had too many miles on it to change over to the synthetic.

I know I'd read about not changing oils on high mileage engines, but I don't think 48 thou is high. Any thoughts ?

Ive been using Amsoil in my 91. 5 Dodge/Cummins 13 years and other vehicles for more than 25 years. The benefits are well known. There are always detractors. If you have a leak fix it. Dont expect the oil to sludge up and plug it like dino oils are famous for. As I understand the difference ; Dino oils have a plethora of molecule sizes, the larger and fewer molecules break down first and so on creating sludge. Synthetic oils, on the other hand have a homogeneous molecular structure ( all the same size). This allows them to resist breakdown because they are all working together. The only dissadvantage is their size and uniformity allows them to find any weak link in your seals and gaskets. What most folks dont know is that if you have a business you can sign up with Amsoil as a commercial account and purchase your synthetics cheaper than dealer cost. You just cant resell them. A major savings, especially if you use synthetics in more than one vehicle. GH.

 

[Edgemann55]

I thought these trucks, the '05 at least, came from the factory with pure synthetic and thats why they take so long to break in and get decent mpg. I'm getting ready for my first oil change at 7k and am now wondering if I should use amsoil or dinosaur oil.

They have synthetic in everything but the engine. Run good dinno oil for 20,000 miles then switch to a synthetic. I use amsoil in everything on my truck but there are other synthetics out there.

 

[Jack in Alaska]

I switched my previous truck, a 98 24v, to synthetic at approx. 130k miles. It started to use it and I had to keep adding during the entire time. I switched back to dino oil(Shell Rotella) and it stopped using. Sold truck at 175k and still not using.



Just my experience... ... ... ... ... .