15-50 vs. 20-50 Engine Oil
09-21-2006, 06:25 PM
#1
Team Owner
Thread Starter
15-50 vs. 20-50 Engine Oil
Is there any significant difference between these two wt oils.....both are 15K extended service fully synthetic.
Mobil1 15-50
Amsoil 20-50
The motor is a stroked 402 that consumes some oil, is a daily driver and sees 10 track days a year. Also live in sunny so cal .......
DH
Mobil1 15-50
Amsoil 20-50
The motor is a stroked 402 that consumes some oil, is a daily driver and sees 10 track days a year. Also live in sunny so cal .......
DH
09-21-2006, 09:12 PM
#3
Team Owner
Even though they are both the same weight, you need to pull the actual Cst viscosity number for each to see what the difference is. Any reason why so high a viscosity?
09-21-2006, 10:33 PM
#4
Melting Slicks
Originally Posted by Dave00C5
Thats some awful heavy oil viscosity to use.
Not for a stroker.Howard, I'd be leary of the long-term effects of cold starting with a minimum viscosity of 20... even in sunny SoCal. If you want an alternative to the ext-perf Mobil-1 15w50, consider Red Line full synthetic.
09-21-2006, 10:51 PM
#5
Racer
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There's no way that I'd go 15k miles between oil changes with either of those oils, unless you're going to perform oil analyses at regular intervals... especially with track days in the plans.
The weight you choose depends primarily on the clearances set by whoever machined the parts for your engine. I assume that it's set up looser than stock since that's common in modified performance engines. Exactly how loose it's set up will help to determine the appropriate viscosity rating. I would ask your machinist or engine builder. Do you happen to know if the engine was blueprinted and if so, what your rod clearances are?
The weight you choose depends primarily on the clearances set by whoever machined the parts for your engine. I assume that it's set up looser than stock since that's common in modified performance engines. Exactly how loose it's set up will help to determine the appropriate viscosity rating. I would ask your machinist or engine builder. Do you happen to know if the engine was blueprinted and if so, what your rod clearances are?
09-21-2006, 11:22 PM
#6
Team Owner
Thread Starter
Originally Posted by Mr. Lucky
Not for a stroker.Howard, I'd be leary of the long-term effects of cold starting with a minimum viscosity of 20... even in sunny SoCal. If you want an alternative to the ext-perf Mobil-1 15w50, consider Red Line full synthetic.
Andy says its fine ..... no problem.
The only reason for the inquiry is that I can get the Amsoil A LOT cheaper and it appears that I am consuming some oil and put alot of miles on the car (500 per week)
Amsoil comes 20-50 not 15-50
DH
Last edited by Dirty Howie; 09-21-2006 at 11:27 PM.
09-21-2006, 11:26 PM
#7
Team Owner
Thread Starter
Originally Posted by brucemoose2
There's no way that I'd go 15k miles between oil changes with either of those oils, unless you're going to perform oil analyses at regular intervals... especially with track days in the plans.
The weight you choose depends primarily on the clearances set by whoever machined the parts for your engine. I assume that it's set up looser than stock since that's common in modified performance engines. Exactly how loose it's set up will help to determine the appropriate viscosity rating. I would ask your machinist or engine builder. Do you happen to know if the engine was blueprinted and if so, what your rod clearances are?
The weight you choose depends primarily on the clearances set by whoever machined the parts for your engine. I assume that it's set up looser than stock since that's common in modified performance engines. Exactly how loose it's set up will help to determine the appropriate viscosity rating. I would ask your machinist or engine builder. Do you happen to know if the engine was blueprinted and if so, what your rod clearances are?
Yes its built to looser tolerences and 15-50 was originally recommended....but 20-50 was okayed today.
DH
09-21-2006, 11:41 PM
#8
Melting Slicks
Originally Posted by Dirty Howie
The only reason for the inquiry is that I can get the Amsoil A LOT cheaper
Royal Purple also makes an excellent 20w50, but I doubt that you can get it cheaper.
09-23-2006, 11:54 AM
#11
Premium Supporting Vendor
Originally Posted by Dave00C5
Thats some awful heavy oil viscosity to use.
A 5W or 10W oil is just not enough when it is 100 outside and oil temps reach over 230.. IMO
09-24-2006, 01:43 AM
#12
Team Owner
Thread Starter
Originally Posted by BLOWNZO6
I use nothing but 20W50 in my engine.. Havoline synthetic.
A 5W or 10W oil is just not enough when it is 100 outside and oil temps reach over 230.. IMO
A 5W or 10W oil is just not enough when it is 100 outside and oil temps reach over 230.. IMO
Everyone is using Mobil, Amsoil, Royal Purple or Redline .....
DH
09-24-2006, 09:36 AM
#13
Premium Supporting Vendor
Originally Posted by Dirty Howie
Not giving you a hard time but why Havoline ?????
Everyone is using Mobil, Amsoil, Royal Purple or Redline .....
DH
Everyone is using Mobil, Amsoil, Royal Purple or Redline .....
DH
No weight I want in Mobil... the other stuff is mail order from here. I don't run oil for any extended period of time, I change it every 3,000 miles so I don't see the point for spending $8 per quart on it. I have always used either Mobil, Havoline or Castrol and have never had any issues, so that is what I stick with.
09-24-2006, 10:13 AM
#14
Race Director
I'm sorry to high jack the thread but, I had a friend order me some 20w50 Amsoil, to be used at WGI. Anyway he delivered it to me the day before, and it was 15w40. I got into it with him and it was just ordered wrong. I put it in drove 5 hrs to get there, 8 sessions, 5 hrs back. i still have 6 qts of the stuff left. I'm running Pocono next weekend 2 days. I'll change the oil this week, should I use the 15w40 or use something else. My car is a stock 346 w/lt's.
