Mobil 1 - Castrol Syntec

[KentheREALone Z]

Soliciting comments;

I own an 07 ST V8 4x4 and an 07 Mustang GT V8. Both require the same oil and filter (I think the oil is 5W-20).

This past summer I put Mobil 1 (6 qts. each) and a Motorcraft filter (FL-820S) in each V8.

In the last few months I noticed lifter tap in both V8's. I likely did not notice it in the summer due to the windows up and a/c on.

I just changed the oil again to Castrol Syntec, with the same Motorcraft filter. No lifter tap.



I've been a dedicated Castrol GTX user for 30 years. I only used the Mobil 1 because Syntec was not available at the time.



Anyone else had this same experience?

 

[Bill Kaiser]

oil

 

[Shelby Crane]

I use Mobile 1. I haven't had any issue with lifter tick. I'm in Georgia.

 

[Aaron Yarbough]

I have a C5 Corvette and Mobil 1 is all I use and never had any issues however, if the Castrol GTX seems to work better for you then I would stick with it. Both are very good oils and doubt you could go wrong using either one of them. In regards to the lifter tap, I would be curious to know if the noise resurfaces after you have put a couple thousand miles on the Castrol?

 

[Alan Peters]

I had a tap with Mobil 1, I used Royal Purple and the lifter tap disappeared too. I'm guessing the oil also. Castrol is a good oil.

 

[Rodger Tellefson]

After switching to Royal Purple, full synthetic, our '01 ST ran smoother, quieter and accelerated easier. I now use RP in the engine, transmission and differential.

 

[Johnny O]

Mobil 1 is thinner for a given weight than some other oils. Not all oils of the same weight have exactly the same viscosity, there is a range that they fall into.

I occasionally get used oil analysis done on my family's vehicles, on every one that I've tried both on I got a better UOA with Pennzoil Platinum Synthetic than I did Mobil 1 and the Pennzoil is about a buck cheaper a quart. Also Motorcraft Blend showed up nearly as well as Mobil 1.

 

[Rodger Tellefson]

JohnnyO, Have you done a UOA on Royal Purple?

 

[Nelson Atwell]

Last time I took my Mazda 3 in for service, I requested Castrol GTX. The service dept said it was bad oil, and they recommended Mobil 1. They had a Mazda 6 (one year old) which was in for a engine rebuild. They said the owner used GTX. I suspect the owner also abused the vehicle, since I never heard of a blown engine so soon, except for Mud's Titan, and some of the Ford stories on this site.

 

[Todd Z]

I noticed the viscosity with the royal purple...



The same weight, the RP is soo much thinner and not as sticky as the other oils...



I hope it protects as well......



Todd Z

 

[Gypsy me]

I put Castro Syntec in my 04, Love it.

 

[Michael Cacioppo]

I've used Mobile 1 for years and have had no problems at all.

 

[Gavin Allan]

Mobil 1 and Mobil 1 filters in everything around my house, changed every 6-months. No problems at all either!

 

[WXMotorSports DecalsPartsAccs]

Here is my experience with Lifter noise. We blew an engine in our M3 race car. Replaced the top half and had lifter noise for a short time. Always used Mobil 1. In fact, all the fluids get replaced after a race.



After many complaints to the mechanic we switched to another shop and I specially told him to drop the oil pan and check the oil pump. Found out we had a hole on top of the pan and a bad oil pump. Therefore, the lifters weren't getting enough pressure with oil.



We now have a 7 qt pan and I'm going to add an accusump so the engine is always pressured up.



My point is I don't think changing brands could cause that. I can see going from Mobil 1 to another brand though.

 

[KentheREALone Z]

My solicitation was really about the Castrol Syntec. This is the first time I've used it. I brought up GTX ("natural oil") because I have a very long, successful history with it. In fact, I have a GM 1984 2.8 L V6 with 220 K miles, and this is in an engine I understand that typically lasted less than 100 K.

Anyway, I'm trying to translate my experience with Castrol GTX (natural) to Castrol Syntec (synthetic).

Still no ticking, in either V8.

 

[Johnny O]

JohnnyO, Have you done a UOA on Royal Purple?

No, never tried Royal Purple. Check the UOA Forum at BobIsTheOilGuy.com, maybe someone has a RP UOA from a 4.0 SOHC. Well, I mean use the Search, there's a lot there.

Or go to www.blackstone-labs.com, they will send you a collection bottle for free, you send it back with your used oil in it and a check for $22.50.