Extended Drain Intervals

Messages
37
Location
Bowmanville, Canada
I am wondering if anyone knows what the definition of "extended drain" means exactly? It used to be that auto manufacturers recommended 3000 mile drains, then 4000 mile drains and now some are recommending 7500 mile drains. I assume that these increasing drain intervals from the manufacturers are not what they consider "extended drains", but they may have been before they implemented them. I hear that in Europe, 20,000 mile drains are normal in some cars there -- is that extended drains? Any thoughts people? Thanks in advance.
 
Messages
263
Location
DFW, TX
I think auto mfgs have always suggested 7500 mi drains under "normal conditions" and 3000 under "sever conditions". At least that is what my 1969 Corvette owner's manual says. IMHO, exteded drain is 5k+.
 
Messages
263
Location
DFW, TX
I'm going from memory here, but I think it was anything from 5w30 to 20w40 for multi-vis and straight 30 if outside temps are >60F. I was really shocked it had 5w30 as I did not think it was available in 1969. I also expected to see 20w50 in there, but it wasn't. The manual is a reproduction, but I don't think they would change any of the data, especially since they included 20w40 (anybody hear of that weight?).
 
Messages
2,077
Location
Cordelia, CA
quote:
I also expected to see 20w50 in there, but it wasn't.
Interesting, CAFE did not start until 75 and did not take effect until '78.
quote:
they included 20w40 (anybody hear of that weight?).
Yup, it's the spec'ed oil above 40F for my '86 Yamaha FZX 700 M/C. Amsoil makes an oil in that range for natural-gas engines. A few other oddballs make it also.
 
Messages
3,683
Location
Chattanooga, TN
I think this board (or maybe another) decided that "extended drain" meant anything beyond what the manufacturer recommended. So, if Toyota says 7500 it would be anything over that. Don't recall if it was the severe or normal schedule though, probably severe so anything over 3000.
 
Messages
263
Location
DFW, TX
OK, I've got my manual and I have a couple of corrections to make. The suggested oil change is 4 months or 6000 miles. For sever operation (dusty roads, primarily < 10 mi trips, hauling,etc) it is 2000 miles or 2 months. Now, here is the oil viscosity recommendations: <20F: 5w, 5w20, 5w30 0F - 60F: 10w, 5w30, 10w30, 10w40 >20F: 20w, 10w30, 10w40, 20w40 Notes: SAE5w and 5w20 oils are not recommended for sustained high speed driving. SAE 30 oils may be sued at temperatures above 60F.
 
Messages
3,683
Location
Chattanooga, TN
I haven't heard of a manufacturer with a 2000 miles severe change schedule. I looked above but I did not see what you are driving. Curious as to who makes this car?
 

Patman

Staff member
Messages
21,989
Location
Oakville, Ontario
quote:
Originally posted by Spector: I haven't heard of a manufacturer with a 2000 miles severe change schedule. I looked above but I did not see what you are driving. Curious as to who makes this car?
It's a 1969 Corvette. I seem to recall that the severe service schedule for some cars back then was even less, like 1000 miles! I think that was when they didn't have oil filters though.
 
Top