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 Regular 1991 Ford Mustang LX Join Date: Apr 2008 Location: Norfolk Posts: 102 iTrader: 0 reviews	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, larger throttle body, maf, 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 Posts: 123 iTrader: 0 reviews	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: 1,559 iTrader: 0 reviews	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 __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

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