the guy who owned my mustang before me said he used synthetic oil, but when i asked what weight he wasn't sure and said ask the guys wherever i buy it what kind to use. is there anyway i can check to make sure its synthetic before i start buying the wrong kind/weight??

 

I run 10w-30 synthetic in my piece

 

in the summer run 10w-30 and in the winter run 5w-30

 

I run 10w30 Mobil 1 all year. Last oil change i put in 10w40. Figure itll help a bit with 140k on the od. No problems yet.

 

isnt the 10wXX regular motor oil? and synthitic like 10w, 20w and 30w??

 

how many miles r on ur car?

 

I use 10w30 conventional in my 130K 5.0, 110+ degree days and the fact it burns a quart every 1k doesnt justify the extra money of synthetic [&:]

 

i wouldny put synthetic oil in a car with that many miles, cars seals and gaskets would be leaking all over theplace, mine has 158k i use 5w30 i think

 

i only use 10w30... it doesnt matter if its winter or summer, modern oil technologies include certain anti-gelling traits that allow you to run many different oils in varying situations. Where i live, 10w30 is fine year round

 

i have hadvery good luck semi synthetic 10W-30motorcraft oil ($2.23 per Qt) and motorcraft filters. IMO, if you are going to be changing your oil every 3k, just stick with coventional oil. If you are going to go 5k or so then maybe think about a good sythetic oil. Synthetic oil is only proven to be necessary in very extreme conditions or where a extended oil change intervals are neededand doesnt really constituit spending $4-$6 fora quart for oil. It also will not hurt a thing if you switch from synthetic to coventional also..