Like it was stated, these oil change places hire minimum wage folks and all they are looking for is a body- brains not required. IF, and remember that's an IF, it is the phasers, you stand about a 10-15% chance that the right oil will correct the issue. Most often when these pins get jammed into the lock ring- it's terminal. If you have a mechanic that you know that is ASE Certified, you might have him take a look at it to make sure it's the phaser and not another issue. Regardless, I'd find somebody that has a clue about your truck to do the maintenance on it and get away from the quicky oil lube joints. I've seen the wrong oil in engines and I've also seen where the morons put automatic transmission fluid in the engine. Obviously, the folks that are servicing your truck either don't care or are too stupid to know what they are doing. Best of luck.