Does synthetic oil really give longer change intervals?

Messages
1,488
Location
Los Angeles
quote:
Can I really go 5-7K miles between oil changes with synthetic?
With a good synthetic: GC Redline Synergyn Amsoil Mobil 1 you can go longer than 7,000 miles.
 
Messages
951
Location
Loveland, Colorado
quote:
"Fact Quaker State® does not recommend extending oil drain intervals beyond the 'severe service' maintenance interval of three months or 3,000 miles, whichever comes first. Also, we are unaware of any automobile manufacturer in the United States that currently recognizes using any synthetic oil beyond the recommended oil change intervals outlined in their owner’s manual."
I guess they haven't read GM/Saab's 2003 9³ SS bulletin that states: "Requires Full Synthetic oil which meets GM-LL-A-025 specification ... with the TIME FOR SERVICE message being set between 8,000 and a maximum of 15,000 miles. If the mileage interval is not met, the message will be set at 2 years. ... It is important to note that this computation is based on the use of fully-synthetic oil which meets GM-LL-A-025 specification. ... If an oil of lesser quality is used, the algorithm will be incorrect and severe engine problems may occur." This is for a turbocharged engine, & they're specifically saying you can only go this long with premium, fully synthetic oil. Gotta luv QS's marketing team! [Dummy!] [ June 28, 2004, 07:59 PM: Message edited by: Eiron ]
 
Messages
436
Location
PHX
quote:
Check out "Myth #7"
The intersting thing is that the "answer" to the myth doesn't explicitly say the myth is wrong......
 
Messages
225
Location
tyler, tx
Our fleet diesel and gasoline engines are serviced for extended drain intervals, 25,000 miles, as are the automatic transmissions with synthetic lubricants by Hydrotex. No failures due to extended drain intervals. For a personal vehicle, it really depends on the issue of "severe service", in conjunction with UOA results. My F-150 gets a UOA every Spring, the results determine whether-or-not the oil gets changed. I use synthetic oil and a Canton oil filter, 8 micron filter element, which is replaced every 10,000 miles, per Canton's instructions.
 
Messages
47,834
Location
Everson WA - Pacific NW USA
I've been doing 10K mile intervals on my Volvo turbo (Amsoil's max recommendation). The car is now just about to 250,000 miles. Enough said. I think Pennzoil is trying to sell oil. Can't blame them, and most of the other stuff they say about synthetic oil is true.
 
Messages
524
Location
Central Oklahoma
quote:
quote: -------------------------------------------------------------------------------- "Fact Quaker State® does not recommend extending oil drain intervals beyond the 'severe service' maintenance interval of three months or 3,000 miles, whichever comes first. Also, we are unaware of any automobile manufacturer in the United States that currently recognizes using any synthetic oil beyond the recommended oil change intervals outlined in their owner’s manual." -------------------------------------------------------------------------------- I guess they haven't read GM/Saab's 2003 9³ SS bulletin...
And I guess they haven't read their own 250K/10 mile warranty which requires oil and filter changes every 4 months or 4K miles, whichever comes first. Interesting that their partner, Pennzoil, now offers the same warranty on their product line. Same terms.
 

KW

Messages
1,686
Location
Central Arkansas
After QS bought Slick 50 I lost interest in them. Though I have seen cars go and go and go on their oils. To me the Slick 50 thing was a turn off.
 
Messages
2,768
Location
Tn
Dave, I think the concern is that if you drive in extremely dusty conditions or if your car is not in top shape and has excessive blow-by and fuel dilution, then a synthetic may not be able to go the distance. A uoa or two will show you the right interval. Cars in top shape with good filtration can absolutely go up to twice the distance on a real syn. I did the uoa thing (and will again) to show me the proper change interval for my car as well as look at overall engine system health. With a uoa or two you will know and not be shooting in the dark.
 
Messages
34,394
Location
NJ
Yes. Synthetics main advantage is longer drain intervals and high/low temp protection. My brother took his car to Toyota yesterday (Solara) and he mentioned M1 to the guy. He said M1/synethetics all break down around 3k miles, the same as dino oil, so it doesn't pay to use M1. I told my brther the guy is moron and NOT to listen to these nit wits. I CAN'T BELIEVE HOW MANY PEOPLE IN THIS WORLD WILL SAY THINGS THAT THEY HAVE NO IDEA ABOUT. IT ****** ME OFF.
 
Messages
2,768
Location
Tn
quote:
Originally posted by buster: Yes. Synthetics main advantage is longer drain intervals and high/low temp protection. My brother took his car to Toyota yesterday (Solara) and he mentioned M1 to the guy. He said M1/synethetics all break down around 3k miles, the same as dino oil, so it doesn't pay to use M1. I told my brther the guy is moron and NOT to listen to these nit wits. I CAN'T BELIEVE HOW MANY PEOPLE IN THIS WORLD WILL SAY THINGS THAT THEY HAVE NO IDEA ABOUT. IT ****** ME OFF.
I will give the guy the benefit of a doubt and not call him a moron. His judgement may have been colored by the Toyota sludge-omatic issue from past history. My friend did have an Avalon that would break Mobil 1. That may have been his reasoning or maybe he's just stupid.
 

Patman

Staff member
Messages
22,012
Location
Guelph, Ontario
quote:
Originally posted by Last_Z:
quote:
Originally posted by ruking77: I have been doing 15,000 mile intervals for a long time (17 years) and also a few miles (664,000) miles.
Dude.....no wonder gas prices are so high. You are sucking up the entire national fuel reserves! [Freak] [LOL!] Anyway.....that's a lot of miles. What vehicle type?

Those miles are not all on one vehicle though. If I remember correctly, they are on two different Toyota Land Cruisers he used to have, each with over 250k on them, and on his Corvette Z06 plus his other car he owns right now (can't recall what kind offhand).
 
Messages
2,794
Location
NM
quote:
Originally posted by ruking77: I have been doing 15,000 mile intervals for a long time (17 years) and also a few miles (664,000) miles.
Dude.....no wonder gas prices are so high. You are sucking up the entire national fuel reserves! [Freak] [LOL!] Anyway.....that's a lot of miles. What vehicle type?
 
Top