Oil question

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69XRRR7
Registered Member
Posts: 366
Joined: 16 Feb 2014, 23:34
Location: Nampa, ID

Oil question

#1

Post by 69XRRR7 » 15 Aug 2018, 19:40

Is anyone using 20W-50 in their Cougars? I want to use Valvoline VR1 Racing oil because of the zinc and the local parts store only has it in 20W-50. I am old school I think and have always used 10W-40. Any comments?
69 XR7 San Jose built
Always under construction
Slightly improved 351W
CCOA member #9421

cyclonelou
Registered Member
Posts: 174
Joined: 12 May 2014, 16:00

Re: Oil question

#2

Post by cyclonelou » 15 Aug 2018, 22:53

If you are in Idaho, 20-50 will be fine in the summer. But it gets awfully cold there in the winter so you may have to go down to 10-40 or 10-30 if you drive that older car in the winter unless you store it then. With the other weights use a zinc additive and you'll be fine if using a modern conventional oil.

preaction
Supporting Member
Supporting Member
Posts: 260
Joined: 26 May 2015, 11:18

Re: Oil question

#3

Post by preaction » 16 Aug 2018, 12:22

Factory spec is 10w30.
67 XR7 6.5 liter auto AC tilt pdb ps thermactor vinyl roof console SS wheels lime frost

canted 393
Registered Member
Posts: 57
Joined: 21 Sep 2017, 05:44
Location: New Hampton IA

Re: Oil question

#4

Post by canted 393 » 17 Aug 2018, 17:50

Just ask them my local napa can overnite 10w30 VR1, they now carry both here in a town of 2500 in rural iowa. Order from summit too if the locals wont.

1970puma
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Posts: 24
Joined: 24 May 2018, 10:37

Re: Oil question

#5

Post by 1970puma » 16 Oct 2018, 10:48

I'll use 20-50 in a stock 1970 - 351W during the summer with no issues. Should be able to find non-synthetic Castrol GTX easy enough (or thru Summit Racing if the local auto part store doesn't have it).
When it gets colder, I switch to 10-40 (regular or synthetic works fine). In either case, I would add Endelbrock Zinc additive if you have the original cam.

69XR7RestoMod
Registered Member
Posts: 146
Joined: 21 Nov 2011, 21:41
Location: North Florida

Re: Oil question

#6

Post by 69XR7RestoMod » 16 Oct 2018, 17:34

Use Mobil 1 15w-50

Walmart always has the best price. Check online before you go. Not stocked in all stores
1969 XR-7 Restomod 408ci 483HP/523TQ, FiTech, TKO-600

ClawIt
Registered Member
Posts: 422
Joined: 14 Nov 2012, 21:33

Re: Oil question

#7

Post by ClawIt » 17 Oct 2018, 08:24

AT-205 Reseal, Lucas Oil treatment, zinc additive, and of course STP high mileage!

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