Oil change oil type question
Thread Starter
Pro
Joined: Nov 2018
Posts: 674
Likes: 102
Oil change oil type question
took my car in and had the oil changed. since they had a record of my car I didn't pay attention to the type of oil they put in it until now
It has had Pennzoil 10 30 fully synthetic oil in it for its life, this time he put in castrol gtx 10 30
do I need to have it changed out and put synthetic back in? will the change cause any oil leaks?
It has had Pennzoil 10 30 fully synthetic oil in it for its life, this time he put in castrol gtx 10 30
do I need to have it changed out and put synthetic back in? will the change cause any oil leaks?
Melting Slicks
Joined: Nov 2011
Posts: 3,183
Likes: 265
From: Virginia
took my car in and had the oil changed. since they had a record of my car I didn't pay attention to the type of oil they put in it until now
It has had Pennzoil 10 30 fully synthetic oil in it for its life, this time he put in castrol gtx 10 30
do I need to have it changed out and put synthetic back in? will the change cause any oil leaks?
It has had Pennzoil 10 30 fully synthetic oil in it for its life, this time he put in castrol gtx 10 30
do I need to have it changed out and put synthetic back in? will the change cause any oil leaks?
Team Owner
Joined: Oct 1999
Posts: 31,976
Likes: 487
From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
Agreed, change it at the normal interval with the synthetic of your choice especially if you are on a stock cam.
Pro
Joined: Sep 2017
Posts: 675
Likes: 195
From: Green Oak Township, Michigan
Oil is Oil.........As long as it meets the specs for your motor, you can use any brand of oil that you want. GM gets money from Mobil Oil for using their oil..Plain and simple, its all about the money. Valvoline is just as good as Mobil 1 is just as good as Penzoil is just as good as Castrol. and so on and so on.
Drifting
Joined: Jul 2017
Posts: 1,365
Likes: 471
From: S.E. Pennsylvania
This is what I use... Good stuff and good price...
https://www.walmart.com/ip/Pennzoil-...5-qt/135786509
https://www.walmart.com/ip/Pennzoil-...5-qt/135786509
Burning Brakes
Joined: Jun 2017
Posts: 1,045
Likes: 275
From: Wichita Falls Texas
I wonder if anyone knows if any synthetic oil on the market today does not meet the specs required for the C5?
I haven't seen one on the shelf of any auto parts store or Walmart.
Just asking.
I use Mobile 1 if it's on sale. If it's not I will use something else that meets the spec.
I haven't seen one on the shelf of any auto parts store or Walmart.
Just asking.
I use Mobile 1 if it's on sale. If it's not I will use something else that meets the spec.
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Team Owner
Joined: Oct 1999
Posts: 31,976
Likes: 487
From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
I don't buy the oil is oil argument but at the same time especially on a stock motor a full synthetic in a recommended weight from Valvoline, Castrol, Mobil1, or Penzoil will be fine. If you have have a blend I'd certainly change promptly at the recommended mileage interval (not the monitor).
I prefer to go with Wix or NAPA gold filters(which are WIX).
https://www.corvetteforum.com/forums...il-filter.html
I prefer to go with Wix or NAPA gold filters(which are WIX).
https://www.corvetteforum.com/forums...il-filter.html
Last edited by 93Polo; Nov 11, 2019 at 09:52 AM.
Team Owner
Joined: Oct 1999
Posts: 31,976
Likes: 487
From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
Thread Starter
Pro
Joined: Nov 2018
Posts: 674
Likes: 102
Why is 10-30 being used? Factory spec is 5-30.
That is what the previous owner used and we are in cali so it doesn't get as cold as other parts of the USA.
But thank you all for replying . I wanted to be sure there would be no harm done to the seals and develop leaks
That is what the previous owner used and we are in cali so it doesn't get as cold as other parts of the USA.
But thank you all for replying . I wanted to be sure there would be no harm done to the seals and develop leaks
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
It amazes me how many people are sucked in by the Mobil 1 advertisement on the oil cap.
I'd change it a little early and start using a full synthetic 5W30 or Euro 0W40 from now on. Both are great oil choices for your C5. Lately, I have been using the Euro 0W40.
From what I understand, all current full synthetic 5W30 oils now use a different specification compared to the C5 oil specification. So, if you must be **** about your oil you really should be looking into that and figuring out where or how to get oil that meets the specification for your car. This applies to Mobil 1 the same as the rest of them.
I'd change it a little early and start using a full synthetic 5W30 or Euro 0W40 from now on. Both are great oil choices for your C5. Lately, I have been using the Euro 0W40.
From what I understand, all current full synthetic 5W30 oils now use a different specification compared to the C5 oil specification. So, if you must be **** about your oil you really should be looking into that and figuring out where or how to get oil that meets the specification for your car. This applies to Mobil 1 the same as the rest of them.
Melting Slicks
Joined: Nov 2011
Posts: 3,183
Likes: 265
From: Virginia
Seems like a lot of ppl are brainwashed into thinking you have to use Mobil1 because it’s on the oil fill cap. It’s proven to be a good oil but it’s not the ONLY oil that is fine for our cars.
Instructor
Joined: Oct 2019
Posts: 169
Likes: 45
From: Enumclaw, WA
The whole low viscosity requirement is ONLY so GM could hit a gas mileage number. The thinner the oil, the better the fuel mileage. Changing oil brands or viscosity is not going to matter one bit. Visit bobistheoilguy.com for all the arguments....
Melting Slicks
Joined: Nov 2011
Posts: 3,183
Likes: 265
From: Virginia
