Hi, I have a 2004 toyota camry v6 3litre that started initially vibrating between 60& 80kms, then a bit at 100-110 kms/hr. Now it's really...

Hi, I have a 2004 toyota camry v6 3litre that started initially vibrating between 60& 80kms, then a bit at 100-110 kms/hr. Now it's really shaking starting at 80 kmh, getting worse at 100 then when I reach 110 it starts to get less vibration. At 118, it's ok, but at 120 it gets worse, then around 130, it's gets really bad. I've taken it into a Canadian tire, which is a national chain in Canada, the tech there said that the cv joints were replaced, & the left strut is leaking. The car has 270k kms on it, I bought it used, the previous owner mentioned that it was shaking before but it was fixed before I bought it. I think he only replaced the cv joints right strut. When I release the gas pedal the shaking is gone. The wheels have been balanced and are currently winters. I know that the timing belt will need replacing soon. I haven't changed the transmission fluid since I bought it and probably should. The rpms are usually between 2& 2.5 k rpm's when driving at 110-120km speeds. I have the blue driver obd scanner and no codes except an airbag code has been detected. Of course, I'd rather not just replace parts since I don't have a ton of cash but if you can guide me in the right direction, at least I'd be targeted as to what to do. The technicians at Canadian Tire are not mechanics, just techs.

Thanks

OMG, while checking the condition of the motor mount, I discovered the coolant reservoir completely empty, with signs of liquid beneath it.  Would a loosely tightened cap cause this or could I be potentially looking at a blown head gasket?  Coolant was low when I bought it used about 2 years ago.  How important is it to get the toyota brand coolant vs something like a prestone for this 15 year old car.  I've also mistakenly mixed pink coolant when I should have put it green coolant.  Coolant temp seemed to remain stable at 81 for the total 3 hour drive I made to Toronto & back.  As for the engine mount, I'd send photos but it looks like the stuff inside the top mount can just be moved around and taken out with my hand without effort. I will try to replace the mount myself but I don't know exactly which model my transmission is between

4-speed U241E automatic
5-speed U151E automatic
4-speed U140E automatic
5-speed U250E automatic

The shifter shows p,r, n,d, 3, 2, L.

 I also have a 98 camry with worn engine mounts but it never vibrated like this.  Could the leaking strut also contribut to this?  I haven't checked the stabilizer bar bushings yet since that would mean getting under the car and it's wet & cold right now.

Will it matter at this stage what brand coolant I use?  Expensive Toyota vs cheaper coolant compatible with Toyota?

pink or green?

How about transmission fluid?  Should I buy the toyota branded fluid or go with what Mister Transmission would put in?  This will be the first time I've ever changed the tranny fluid in this 15 year old car?

Drain & fill only

THanks!!  That puts me at ease since I don't want to screw things up, especially on limited funds!  I hope they have that SuperTech Brand in the walmarts in Canada.  Since I've just been topping up the coolant reservoir for the last 2 years when I remember due to the fact that it was low when I bought it, is there anything catastrophic that can happen if I do have a blown head gasket?  I only paid about 3K for the car used and I think that repair might cost more than the car.  I can put up with the inconvenience of being towed home.  I do have CAA which can tow me back within the distances I travel .