You are right. I should have said rust proofing by dealers.
My dealer offered a 10 year warranty. Initial cost $800 (oil base) plus $45 inspection and/or re-application every year from there on. Total cost for the 10 years will be $1205 (canadian not including taxes).
I have to pay Rust Check $135 on the yearly visit so the total cost for 10 years will be $1350.
The dealer option seems better isn't it?

I’d rather pay the 130 each year. You might sell or trade the car in a few years in which case you save $.

Also, I’d rather pay the 130 each year for the next 10 years instead of 1200 all at once. It’s still cheaper. Your money is worth more now than it is 5 or ten years from now.

I use Krown on my 17 Wrangler. I’ve been very happy with the results.

That makes more sense.

Depending on how well the product is applied and what product the dealer actually applies, maybe. I work at a dealership and trust me, they have very little to gain by your vehicle lasting a long time. I'd go with an outside professional (except for Ziebart) any day of the week.

I hear what you are saying but
1. I only have to shell out $800 initially if I were to pay cash. I have the option of financing that together with the vehicle.
2. If I were to sell it in a few years (don't think I will) the dealer rustproofing could be attractive to protential buyers.
3. I presume the shop who does the work for Toyota should have a better knowledge on where to spray.
My 03 TJ had the very first rust proofing done at Krown and I watched where they sprayed and I did the same in subsequent years. I guess Krown didn't know the windshield frame and front fenders were prone to rust so they had to be replaced in a bit over 10 years although the rest of the jeep was rust free.
It's just my personal experience for OP's consideration. I could be wrong.

Like I said to KarlwithaK, I thought rustproofing company who contracts with a specific dealer/brand would have better understanding on where is prone to rust. No?
Ziebart, Krown, Rust Check - thought they all offer similar oil. Why is Ziebart a problem?

Ziebart is a high pressure outfit and there are several problems. (And this is all from personal experience.) First, there's the price. For instance, you can get just the undercoating done around here for about $800 including "free annual resprays." Free? I think it's pretty obvious that the cost of the resprays is built right in there.

Second, the annual resprays are an annual opportunity for them to twist your arm for additional services. They always have a very long list of things that you really need. And the pressure they apply is stupid. I hate having my arm twisted.

Third, the undercoating in particular is a horrible product. Remember, although it somewhat prevents corrosion, it doesn't stop corrosion that's already started. So what happens at the annual resprays? They cover up the rust that's started and everything looks just fine. But the rust that's started keeps right on forming and you can't see it - until it's too late. In fact the undercoating actually traps moisture to further accelerate corrosion. What a racket!

And finally, the quality of the work you get is highly dependent on which minimum wage flunky applies it. Starting to get my drift?

Please forgive my brutal honesty here, but I really, really don't like the company, their products or their ethics.

I'm totally sold on the effectiveness of Fluid Film. Last year I had my buddy weld on the frame rail end caps for my winch, and neither of us had spray paint on us at the time. He just soaked it with Fluid Film and I went like that all winter, and it's still not rusty. To be fair, I wasn't driving a ton this winter, but I was still out in the salt and brine more than I would have liked.

I've gotten my truck oil sprayed at a local place several winters now, and it has definitely slowed the rust down big time. They use new hydraulic oil in all the body panels, and new heavy gear oil on the undercarriage. It's an absolute mess to work on, but at least I have a truck to work on, lol

If I were starting with a new vehicle that had never been oil sprayed, I think I'd go for something more waxy vs oily, like CRC Marine 06026, which the reviews say is cosmoline-based.

Pic of my frame rail after a year of being unpainted, but just covered with Fluid Film.