I'm Switching Motor Oils


Active Member
Rating - 100%
2   0   0
May 19, 2018
Cooke County, TX
The small PF25 and large PF35 small block Chevy filters have no valve. The PF1218 is sized like the 35 but does have the valve. GM came out with the 1218 in the early '90's as a band-aid to the piston slap noise the 5.7K engines had.


Active Member
Lifetime Member
Rating - 0%
0   0   0
Dec 7, 2017
Southwest TN headed to TX
I've run nothing but Mobil 1 & a Motorcraft filter on my last three Ford trucks.

I sold the 2007 F150 to my BIL at 140k, it has 175k on it now and going strong. He swears it runs like new.

My current truck is an F250 gasser with about 50k. Since it's first oil change (I perform them all) it's been Motorcraft filter and Mobil 1 - every 5k - easier to remember changing at the 5's!

Since I change at such short intervals, I'm thinking about switching to Castrol GTX High Mileage synthetic blend, and the same Motorcraft filter. The oil is about half the cost of the Mobil 1.

Any experience with the Castrol GTX? Thoughts?
I used Castrol synthetic or Mobil 1 at 5-6000 mile intervals for 30+ years. After a vehicle was old I sometimes ran 50% mixture of synthetic and conventional oil. None had problems with oil consumption and usually ran well until given to a child or hit by a memphis driver. When I began having a problem finding the proper weight in Castrol, I started using Mobil 1.
The company I worked for wouldn't pay for synthetic on their leased F250. The engine was still in good condition when the truck was replaced. After 250,000 miles it was traded for a newer model F150 which uses synthetic oil.
Last edited:


Rating - 100%
1   0   0
Aug 9, 2011
Any ticking or clickity clack at start up on a Ford that's not low on oil is most likely a bad timing chain synchronizer(cam sprocket), stretched timing chain or bad chain tensioner. True through 3 generations of Ford motors 4.6, 5.4 or newer 3.5 V6. On a Chrysler 3.6 that ticks all the time it's probably a failed roller rocker arm.

As far as oil, pick a synthetic/blend and check it, top it and/or change it regularly. I recommend 5k even with synthetic but that's a personal preference. One that's kept my 03' Dakota with a 3.9 going for over 295k.
Good info. I was wondering if you would post. I have become convinced that anymore, it is frequency of changes that counts more than the oil used. That said, I still use Motorcraft filters and Mobil 1 or another higher end synthetic.


One of the idiots
Rating - 100%
3   0   0
Apr 9, 2013
50K is not high mileage. Not sure about F*** or other brands but high mileage doesn't start on an LS-based engine until at least 150K miles.
I've torn down a lot of LS platform engines, and I'm pretty convinced they'll last forever if you wanted them to. If the oil was changed regularly and a quality filter was used, there is almost zero detectable wear at 100k. One example, my wife bought a 98 Camaro with like 45k on the clock off a used car lot. She did heads, cam, headers, converter and a 100 shot and drove it that way for another ~50k. We pulled the motor at 94k and change to install the new setup (forged LQ9-based low compression, T76 turbocharged). We tore down the motor to sell off the components, and it was still remarkably fresh. No cylinder bore wear, original hone pattern still nice and clear. Rings were nice and square, ring gaps nice and tight, very little carbon buildup behind them. Main and rod bearings had small areas that were polished in the expected locations, but still uniform thickness. Original timing set was fine with very little chain stretch despite the increased load of the Comp Cams XE-R lobes and stiffer valve springs. Everything internally was very clean, no idea what oil the original owner ran but we always ran Mobil 1 and changed fluids on a 'severe duty' schedule between 3k and 5k.


Active Member
Rating - 100%
1   0   0
Jan 2, 2021
Edom, TX
I switched to Schaeffer oil a few years ago. I run it in everything I own, which includes two tractors, a bulldozer, a welding machine, two trucks and an SUV. I even put it in my lawnmower. Everything runs smoother, and gets better fuel economy. What sold me was a Schaeffer rep doing a temperature reading on a Harley Davidson exhaust before and after an oil change. And the temp gauge he was using was not his. It belonged to a welding shop where this took place.

To each his own, and there are many fine oils out there. But my personal results are amazing. And I was skeptical at first.


Rating - 100%
3   0   0
Jun 7, 2011
Katy, TX
Oils are generally the same it is the additive packages that are mainly different. Of course there is a difference between syn and dino. I would stay away from the blends unless you know the ratio because it could be 1% or 50 %. Some of the cheaper/store brands will be the same oil as the majors but a different package. I think the filter is important I l use Wix or Napa gold(same as wix). That came out second in the engine master tests ToddNJoyce referred to.


TGT Addict
Rating - 100%
2   0   0
Jul 2, 2017
From a spec POV, oils are designed to meet a specific specification as determined by carmakers.

Specs are generally met based on viscosity and additive pack. Some specs call for synthetic or semi-synthetic, some are met with Dino oil.

You can exceed the spec, but you don’t want to use an inferior spec.

Sent from my iPhone using Tapatalk Pro


Staff member
TGT Supporter
Rating - 100%
18   0   0
Jan 22, 2013
San Marcos
Y'all want a rabbit hole to go down? https://bobistheoilguy.com/forums/

I'm not too particular about the oils I use as long as they're name brand - probably use Mobil 1 more than anything. However, on my new car with a GDI motor, I've done a lot of research and I'm pretty convinced to use the Castrol (Edge?) synthetic oil primarily for carbon deposits on the intake side.



Greeneye Tactical
third coast
DK Firearms
Tyrant Designs
Every Day Man

Latest posts

Forum statistics

Latest member
Top Bottom