Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.
Mixing engine Oils
- benv6
- Member
- Posts: 418
- Joined: Thu Apr 30, 2015 2:28 pm
- Location: Berkshire
Mixing engine Oils
I am due for a service and I will be going for the 5w40 instead of the 0w30 (Castrol Edge)
My question is that I do have about 2l some 0w30 left from last service, and was wondering if I can mix it with the new 5w40 ?
My question is that I do have about 2l some 0w30 left from last service, and was wondering if I can mix it with the new 5w40 ?
- Mad Professor
- Member
- Posts: 611
- Joined: Sat Dec 20, 2014 7:38 pm
Mixing engine Oils
Wont do any harm IMHO as long as both are fully synth
Present : 987 Box
Past history : ,Z4MR ,Cat HPC evo , XKR , Eunos VR , Eunos VS, Westie S8 ,TVR S2 , S54 Z3MR, SL500 , TVR Wedge 4.6 , Cat Xflow , Saab 900 Turbo ,Cat VXE ,Cat BDR, Cat Twincam , Elan S3 , Haldane Healey, Lancia HF turbo
Past history : ,Z4MR ,Cat HPC evo , XKR , Eunos VR , Eunos VS, Westie S8 ,TVR S2 , S54 Z3MR, SL500 , TVR Wedge 4.6 , Cat Xflow , Saab 900 Turbo ,Cat VXE ,Cat BDR, Cat Twincam , Elan S3 , Haldane Healey, Lancia HF turbo
-
Onlineronk
- Lifer
- Posts: 14225
- Joined: Tue Feb 24, 2009 11:50 am
- Location: Durham
Mixing engine Oils
Why do you want to go 5w Ben?
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with.
So I bought a 35is with all the toys to play with.
- Smartbear
- Lifer
- Posts: 13685
- Joined: Wed Feb 05, 2014 6:54 pm
- Location: a barn in Somerset
Mixing engine Oils
Hi, as the mad professor says-its fine as long as they are both synthetic & the grade difference wont matter
Rob
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
- benv6
- Member
- Posts: 418
- Joined: Thu Apr 30, 2015 2:28 pm
- Location: Berkshire
Mixing engine Oils
I want to see what would be the MPG difference, I heard you would get better MPG with 5w40
- cj10jeeper
- Lifer
- Posts: 17846
- Joined: Fri Jun 22, 2007 11:50 am
- Location: Lichfield, England
Mixing engine Oils
Real bad idea to just change oil grades. Manufacturers specify oils grade and other factors for very good reason
Jaguar F-Type 3.0 Supercharged V6 S, Stratus Grey, LSD, Active Exhaust, CF wheels, Performance brakes, Sports seats and mods ongoing
Gone but not forgotten Z4 3.0i SE Roadster ///M front, Red ///M leather seats, Aero sills
Gone but not forgotten Z4 3.0i SE Roadster ///M front, Red ///M leather seats, Aero sills
- Smartbear
- Lifer
- Posts: 13685
- Joined: Wed Feb 05, 2014 6:54 pm
- Location: a barn in Somerset
Mixing engine Oils
If that's your reason then you're going the wrong way, the 0w30 is a less viscous oil inducing less drag on the engine
I would be surprised if you measured much difference though
Rob
Last edited by Smartbear on Mon Apr 17, 2017 7:01 pm, edited 1 time in total.
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
- mr wilks
- Legend
- Posts: 21897
- Joined: Wed Jul 04, 2012 10:02 pm
- Location: Lancashire
Mixing engine Oils
Agree with Rob , , you are more likely to see a worsening of MPG going 5w40 & a twin turbo engine where oil is a real factor in keeping running temps down i would be spending more time choosing the right oil than deciding what grades
5w 30 will see you right , as for which brand ?
Do some digging & some reading but in my mind Millers is the one for both cold start & hot running cycles
5w 30 will see you right , as for which brand ?
Do some digging & some reading but in my mind Millers is the one for both cold start & hot running cycles
3 ZMRs
3 E89s
5 Si coupes
5 Si roadsters
997 C4
TTRS
F82 M4
MK7 Golf Gti
current Bmw 6 Gran Turismo
3 E89s
5 Si coupes
5 Si roadsters
997 C4
TTRS
F82 M4
MK7 Golf Gti
current Bmw 6 Gran Turismo
- buzyg
- Legend
- Posts: 26531
- Joined: Fri May 20, 2011 6:11 pm
- Location: Cornwall
Mixing engine Oils
Agree with Rob here, don't follow the logic. Interested to know the result though.
-
Onlineronk
- Lifer
- Posts: 14225
- Joined: Tue Feb 24, 2009 11:50 am
- Location: Durham
Mixing engine Oils
Stick with the viscosity specified is the best advice and I would not mix oils unless absolutely necessary.
I won't mix screenwash!
I won't mix screenwash!
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with.
So I bought a 35is with all the toys to play with.
- RJS-Z4
- Senior Member
- Posts: 2387
- Joined: Wed Feb 29, 2012 3:43 pm
- Location: SE London/Kent
Mixing engine Oils
As these chaps quite correctly say, don't mix them. Properly cheap skate thing to do...
Also, better MPG, you're going the wrong way in viscosity as is already said.
Finally, the only reason I've ever heard of people going thicker is to reduce any very slight misting/leaks that are showing on seals due to thin oil.
Also, better MPG, you're going the wrong way in viscosity as is already said.
Finally, the only reason I've ever heard of people going thicker is to reduce any very slight misting/leaks that are showing on seals due to thin oil.
Titanium Silver E85 Mods Done - 224's, Stubby, Amarone //M seats, ZHP, Retrofitted Wind Deflector, Aux In
- Smartbear
- Lifer
- Posts: 13685
- Joined: Wed Feb 05, 2014 6:54 pm
- Location: a barn in Somerset
Mixing engine Oils
I've heard of oil burning problems being diminished by using thicker oil as wellRJS-Z4 wrote: ↑Tue Apr 18, 2017 1:31 pm As these chaps quite correctly say, don't mix them. Properly cheap skate thing to do...
Also, better MPG, you're going the wrong way in viscosity as is already said.
Finally, the only reason I've ever heard of people going thicker is to reduce any very slight misting/leaks that are showing on seals due to thin oil.
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
- benv6
- Member
- Posts: 418
- Joined: Thu Apr 30, 2015 2:28 pm
- Location: Berkshire
Mixing engine Oils
thanks Guys - Got my answer now