Going to try a 5w20 in my 93 Vic tomorrow

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I went to Canadian Tire and bought one of those 4.4 liter jugs of Quaker State 5w20 and got the free QS filter. My 93 Vic has 182000 miles. I've got 2 bottles of SLOB left, think I should add one to the 5w20?
 
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I know the vics ask for 5w20, but severe fleet operations still ask for 5w30, such as cop cars.
 
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My 05 Vic uses 5w20 synthic blend Motorcraft and seems to like it even in the jungle heat here in Miami.But the 93 really calls for 5w30 Dino to which i used in my 99 4.6 which worked well.I would use 5w30 Dino in the 93 if it were me.
 
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quote:
Originally posted by 06RANGER: Okay, I'll bite. Why thinner viscosity at higher mileage? Why QS?
Just a guess but since the original poster is also limited by lame Canadian choices: Almost all of the 5w20 I see in Canada is more expensive than 5w30. Some say it is better quality oil (Group II+ or Group III) to meet the 5w20 spec . I think Ford retroactively specs 5w20 for his engine, so he was just getting the highest quailty oil for the price? Why QS? There was a sale on Canadian Tire which is one the only large, National common retailer of Auto Parts. $12.49 CDN for a jug of oil and they toss in a Filter (normally $7) for free. The QS Filter is made by Purolator. About 95% of what is sold at CDN Tire or Walmart is made by Fram and still costs $6. We have no $2 Wix or Purolator or Champion filters here.
 
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quote:
Originally posted by Pook: I know the vics ask for 5w20, but severe fleet operations still ask for 5w30, such as cop cars.
Absolutely incorrect! If this is a 4.6L, Ford specs 5w20 back to 1992, including severe fleet operations such as cop cars.
 
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I hope you have really fresh valve seals in your vic. I had a 94 vic and it drank about 1 qt every 600 miles using 10w-40 because of the worn valve seals. I can't imagine the clouds of smoke left behind at a red light using 5w-20. The crown victoria I had was a great car and ran perfect but a $800 valve seal job on a $1000 car didn't make sense. The valve seals in the early mod motors started going bad at very low mileage. Luckily this was fixed later on.
 
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