5W30 or 10W20?? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > General Tech
Register Home Forum Active Topics Photo Gallery Auto Loans Insurance Garage Mark Forums Read Auto Escrow

General Tech Have a question that is not covered by one of the other categories? This is the forum for all other items not specifically covered in other categories.

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 05-19-2003, 20:33   #1 (permalink)
Kodak Moment
marine1's Avatar
Join Date: Jan 2002
Location: Anywhere EXCEPT a Holden deale
Posts: 990
5W30 or 10W20??

On the oil cap in my AU XR6, it says to use 5W oil. However, when I take it in for service, I've noticed (on the invoice) that they put 10W oil in?? Would there be any difference in engine performance or should I insist on them using 5W oil???
marine1 is offline   Reply With Quote
Sponsored Links
Old 05-19-2003, 21:50   #2 (permalink)
BA'o'Matic 100% working.
Dellboy999's Avatar
Join Date: May 2003
Location: Victoria
Age: 44
Posts: 3,838

As the saying goes Oils Aint Oils!

The oil numbers mean viscosity cold / viscosity hot

Meaning a 5w oil will move faster and protect agaisnt wear faster than a 10w oil, and then as it gets hotter it gets thicker so as you mentioned a 5/30 oil will be thinner at cold, and thicker at hot (stick to the engine bits more) and the 10/20 will be thicker at start, and thinner at hot so not sticking to bits so much.

I would go with the 5/30 if I were you, not a 10/20 (not that I have heard of a 10/20 oil)

I did put something here, but it vanshied, I think

"So long and thanks for all the fish!"
Dellboy999 is offline   Reply With Quote
Old 05-19-2003, 22:38   #3 (permalink)
Registered User
Martin's Avatar
Join Date: Feb 2001
Location: NSW/ACT
Posts: 3,023
You can get 0W20 I think the 4.6 Mustangs run it and probably the Falcon 5.4s also.
1993 ED XR6 M5 (1 of 329)
Polynesian Green
Turbo on the way!!
1993 EBII Fairmont (Now wrecking, PM if you want any parts)
1988 Nissan R31 Skyline
Martin is offline   Reply With Quote
Old 05-19-2003, 23:44   #4 (permalink)
Mustang Owner
Join Date: Sep 2002
Location: Bowen Mountain, Sydney, Austra
Posts: 358
I would have thought a 5W-30 or a 10W-20 would not be good for Australian Conditions.

That kind of oil would be great for somewhere cold and where there is snow but think about how it would protect come summer months.

The Mobil 1 I use is 5W-50 and I think offers the best all round protection.

The first thing I would be doing is consulting the service manual
Used to be Mustang1966coupe.

66 Silver Frost Mustang 289 Windsor
71 XY GS Fairmont in Bronze Wine 302 Windsor
92 EB XR8 302 Windsor

Sure do love those Windsors
66_mustang is offline   Reply With Quote
Old 05-19-2003, 23:54   #5 (permalink)
Black 200kw wheel barrow
FalKeen's Avatar
Join Date: Aug 2002
Location: AWC - Taren Point, Sydney
Age: 32
Posts: 3,626
i was under the impression that they first came out with a 5W/30 rating and then ford upgraded the requirement to 10W

that was my understanding anyway
FalKeen is offline   Reply With Quote
Old 05-20-2003, 01:50   #6 (permalink)
Registered User
Join Date: Sep 2002
Location: 27 00S 153 07E
Posts: 1,944
Yeah, that's right. I reckon a 5W oil is too thin for Australian conditions, unless you live at Mawson :)

I wouldn't even use a 10W oil, but then again that depends on the mileage of the motor.
"I married Miss Right. I just didn't know her first name was Always."
TopGhia is offline   Reply With Quote
Old 05-20-2003, 02:32   #7 (permalink)
Two SC 61's = trouble
ebxr8240's Avatar
Join Date: Jul 2001
Location: Penrith,nswAus/Morrinville.NZ
Age: 62
Posts: 6,360
These engines now run tighter clearances and are designed to run thinner oil to maintain oil volume especially at cold temps where most the wear is..But really it doesn't matter too much so long as there is quality oil in there and changed often...imo
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...
ebxr8240 is offline   Reply With Quote
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > General Tech

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 03:09.

Powered by vBulletin® Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.