What oil should I use? - Pontiac G6 Forum
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 03-16-2014, 12:01 PM Thread Starter
Junior Member
 
Join Date: Sep 2013
Posts: 4
 
What oil should I use?

Hey guys, I have a 2005 G6 with 152,000 miles. I've been using Valvoline high milage synthetic blend 10w-40 oil. I was wondering if I should keep using that or switch to a synthetic blend or a different weight? I live in NEPA so the temperature has a pretty drastic change from winter to summer and I know the oil weight is based on temperature but I don't know much about it. I have also noticed a slight knock when I first start my car cold but goes away when it warms up. Any help or insight into what oil I should use or anyone else uses with similar conditions would be very helpful and appreciated! Thank You!!
jxa5094 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 03-16-2014, 07:35 PM
Senior Member
 
Join Date: May 2009
Location: Portage, MI
Age: 29
Posts: 638
 
how about what the manufactuer recommends which is 5w-30

2008 Pontiac G6 GT Dark Gray Metalic
Bought Feb 28 2009 with 24k miles now has 130k miles RIP Baby death snowplow 1-30-11
https://www.g6ownersclub.com/forum/showthread.php?t=4757

Carbon Black Metalic 2009 G6 GXP Coupe
Bought Oct 8 2010 with 35 miles

Mods so far: every single performance mod and a whole lot more, fastest NA G6
https://www.g6ownersclub.com/forum/showthread.php?t=7974

1/4 mile: [email protected] 109.23

Performance Red Metalic 2009 G6 GXP coupe
bought june 29 2012 with 3400 miles

Mods: RACE CAR- full race fuel setup and in the process of converting to RWD with a 6spd manual trans
https://www.g6ownersclub.com/forum/sh...ad.php?t=13140
1/4 mile: [email protected] 101.95
SexyG6 is offline  
post #3 of 6 (permalink) Old 03-17-2014, 02:04 AM
OOBER SUPER MEMBER
 
CruisinG6's Avatar
 
Join Date: Jul 2009
Posts: 4,232
 
That knock is probably because (when cold) the oil is too thick to get around fast enough. I'd stick with the manufacturer recommendation of 5w-30.
You could probably run 10w-30 during the summer though.
CruisinG6 is offline  
Sponsored Links
Advertisement
 
post #4 of 6 (permalink) Old 03-17-2014, 06:45 AM
Senior Member
 
cmessick's Avatar
 
Join Date: Jun 2011
Posts: 117
 
You can go up or down in viscosity... but its generally really frowned upon for weights..

For winter you could go 5w-20 or for super hot climates 5w-40.. this is all about viscosity..

Oil weights is the size of the oil molecules.. 0w would be too fine and could be burned by the engine... 10w would be too large and not get in the cylinder walls and could cause excessive wear.. generally the tighter the engine tolerances the finer the oil weights..


so.. here is the deal.. run 5w-30 unless you have really good reason.. 5w-20 if you see temps BELOW -20* and 5w-40 in the summer if you see temps ABOVE 110*.. other than that.. use the recommended 5w-30 and nothing else..
cmessick is offline  
post #5 of 6 (permalink) Old 03-17-2014, 02:14 PM
Senior Member
 
USMC0311's Avatar
 
Join Date: Dec 2011
Location: Chicago, Illinois
Posts: 130
 
Stick with the synthetic blend and stop using 10w-40. Like CruisinG6 said you get that knock in cold winter because of the oil weight. Through time you can start damaging your internals even if it's for a short period during start up. I stick with 5w-30 but when winter arrives I switch to 5w-20 if I get the chance, and I've always used Mobil1.
USMC0311 is offline  
post #6 of 6 (permalink) Old 03-21-2014, 12:32 PM
Senior Member
 
Join Date: Jul 2009
Posts: 470
 
I use 5W30 full synthetic in my GT - one oil change a year. I add about 1/2 a quart after winter and then change it every July.

I don't like synthetic blends and/or winter oil. The manufacturer makes more money off of this oil than any other, because they can add as much, or in most cases - as little full synthetic stock as they want. Some blended oils have as little as 10% full synthetic. I would go with full synthetic 5W30, or conventional 5W30. As I change my oil only once a year and I have very little burn off 5W30 is the best choice. Temps can go -25C in winter and easily reach 30C+ in the summer.

10W40 will also reduce mileage. 5W30 reduces friction, and a full synthetic 5W30 will reduce it more. This is one of the many reasons why you can drive longer using full synthetic oil. Full synthetic also flows to vital engine components (top end of your engine) quicker in cold weather.

'11 Ram SXT 4x4 quad cab - 5.7L V8; 128,200kms
'09 Malibu 2Lt 3.6L - 140,000kms purchased 1 March 2019

'06 Pontiac G6 GT - 3.5L V6; 162,000kms (rear ended 15 Feb 2019, and given totalled title by insurance)
360ci is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac G6 Forum > Technical Discussion & Modifications > General Maintenance

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac G6 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Rear Struts Bad - Leaking Oil - Strong Gasoline/Oil Smell? AZJ0SH General Maintenance 27 10-23-2015 01:56 PM
Oil Pump Drive oil leak G6 3.5 V6 praxos Problems and Solutions 0 09-13-2013 11:58 AM
Oil leaking by oil cap? 80zThomas Problems and Solutions 2 04-02-2013 11:59 PM
Oil level on engine oil dipstick always increases. Mugunthan_06_G6 Problems and Solutions 4 12-26-2012 08:34 AM

Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome