gramsde9

i thought "Castrol"was reccomended oil?Does synthentic oil REALLY improve engine life?And what synthetic oil is good?Cause that stuff is expensive!

blackbetty

motorcraft synthetic 5w20 is recommended, and is the only type of oil you should put in, dyno oil is not recommended, and the cheapest way to do a proper oil change is motorcraft oils and filters...its oem spec

gramsde9

soooo which is better?Synthetic or conventional oil?And what brand is best?I use castrol oil 5w20 NONsynthetic.What does synthetic oil have that the other doesn't?

gramsde9

sorry i went too fast and overlooked the last post!

blackbetty

change to synthetic as its manufacturer's recommended specs.

http://www.carcraft.com/techarticles...oil/index.html
decent link explaining differences on a google search i just did

TG-Austin

Thought I would jump in on 2 points here.

First, and this one is critical, when you remove your old oil filter, make absolutely sure the gasket came off with it. I have a friend who works at a major oil change shop and he says he sees them stick to the block all the time. If you put the new filter on with the old gasket still in place, it will likely blow the gasket out and you are in big trouble.

Second, my brother has connections with Mobil, and he worked with them and GM (I know) to do a 100K test using Mobil 1. They tore down a brand new motor and recorded all of the specs on bearing races and clearances. They then put 100K miles on the motor in NYC Taxi service giving it 5K mile oil changes with Mobil 1. They tore the motor down again at 100K miles and the amount of wear was virtually unmeasurable.

In my books that says a ton about the impact synthetic oil can have, and especially Mobil 1. I use it in all my vehicles including my boat and my motorcycle. My ex has my old 98 5.4 Expedition with over 150K miles on it and it runs and sounds like new. Of course her new husband isn't using Mobile 1 in it any more so who knows what happens now. Maybe it will only make it to 200K

Terry
07 F150 Lariat 5.4

Beast7.3

So my truck has just over 100K on it, and I'm thinking about switching over to synthetic. I think the benefits are more than worth the extra cost. A couple questions though,

1) Royal Purple? This is what we are going to start running in my dad's F350 and I've heard some good things. What do you guys think and any other brands that are good oils?

2) To do the switch, do I need to run a flush or anything through my oil pan after taking the conventional oil out?

mitchalvin

Not according to Royal Purple, most modern synthetics are completely compatible with conventional motor oils and will not break down or other undesirable effects. Old Amsol would cause problems when mixing with conventional oils but that problem has been fixed.

The Ford techs state that using other brand filters will void you warranty, this is not true unless Ford start distributing there filter free of charge. Some of the Diesel filters are Ford only because of small changes in the filter can that aftermarket filters do not take in to effect. Purolator filters are the same as the motorcraft for all gas engines, Racor filters are used on the Diesel engines.

Wspil80

also dont forget to start your truck up and then turn off before your done. the engine will suck up some oil and you may need to add more.

rplatt56

first off, Motorcraft oil is not synthetic, its semi synthetic. But as far as what oil is best. I have found no difference in any semi or fully synthetic oils except for the price. Motorcraft is by far the cheapest price wise. The whole key to this is to follow a reasonable maintainence schedule and stick to it.I used to be the person who changed his oil every 3k religiously. But after much research changed to the every 5k approach. My Motorcraft oil is still fairly clean upon change out so im convinced so far. Those Chevys and Dodges may beat me off the line but sooner or later i'll pass then along side the road. And if they are nice i'll tow them home.