Conventional or Synthetic

rusty2407 · May 10th, 2008, 12:32 PM

Im purchasing a remanufactured engine from autozone for my 5.0 91 lx and i was wondering after the first break in period with the conventional should i stick with it or switch to synthetic from there on out? And does anyone have a brand preference, I have always used castrol in my rodeo, but obviously my mustang is no isuzu.

Kobra Killer · May 11th, 2008, 01:12 AM

For break-in use non-detergent 30-40W conventional oil for 1st 500 miles.
Then switch to 10W-30W/40W conventional.
If you change oil twice a year (spring/fall), you don't need synthetic.
It is for people that neglect their cars.
With regular oil changes, 300K miles is not uncommon for conventional oil.
Overheating is what causes rapid wear on rotating parts.

Racinjason81 · May 12th, 2008, 09:48 PM

go synthetic since it will reduce wear and friction after you break it in on conventional.
We had a van(5.4 v8) that came into our ford dealership that came in for an axle leak which ran real strong (and still is) ,so I looked at the odometer and what did i see over 500,000miles on it.Guess what type of oil he runs Mobil 1 synthetic

May 10th, 2008, 12:32 PM	#1
rusty2407 Newbie Join Date: Apr 2008 Posts: 26	Conventional or Synthetic Im purchasing a remanufactured engine from autozone for my 5.0 91 lx and i was wondering after the first break in period with the conventional should i stick with it or switch to synthetic from there on out? And does anyone have a brand preference, I have always used castrol in my rodeo, but obviously my mustang is no isuzu. __________________ BBK CAI and Shorty Headers, Cobra Upper/Lower Intake, Walbro 110, 24# Injectors, 3.73 gears, Drilled and slotted front rotors, King Cobra clutch, Cobra wheels w/ sumitomo tires, flowmasters

May 11th, 2008, 01:12 AM	#2
Kobra Killer Regular Join Date: Sep 2006 Location: Arvada, CO Posts: 72	For break-in use non-detergent 30-40W conventional oil for 1st 500 miles. Then switch to 10W-30W/40W conventional. If you change oil twice a year (spring/fall), you don't need synthetic. It is for people that neglect their cars. With regular oil changes, 300K miles is not uncommon for conventional oil. Overheating is what causes rapid wear on rotating parts. __________________ Clevelands Rule https://home.comcast.net/~jimmiephil...er_project.htm

May 12th, 2008, 09:48 PM	#3
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,198	go synthetic since it will reduce wear and friction after you break it in on conventional. We had a van(5.4 v8) that came into our ford dealership that came in for an axle leak which ran real strong (and still is) ,so I looked at the odometer and what did i see over 500,000miles on it.Guess what type of oil he runs Mobil 1 synthetic __________________ Speed kills drive an import and live forever. 1991 LX 5.0 H/B 1990 T-BIRD SC

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